Final California 2024 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 8 - Santa Ana Region

Water Body Name:	Canyon Lake (Railroad Canyon Reservoir)
Water Body ID:	CAL8021100019990208151525
Water Body Type:	Lake & Reservoir


DECISION ID	149137	Region 8
Canyon Lake (Railroad Canyon Reservoir)

Pollutant:	Indicator Bacteria
Final Listing Decision:	Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Delist from 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Reason for Delisting:	Applicable WQS attained; due to change in WQS
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. The State Water Board’s Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California (the “ISWEBE Plan”) contains two bacteria water quality objectives applicable to the REC-1 beneficial use, which were adopted on August 7, 2018. Because the salinity level of this waterbody is equal to or less than 1 part per thousand 95 percent or more of the time, the E. coli bacteria objective applies. Therefore, this waterbody is being considered for removal from the CWA section 303(d) List under section 4.3 of the Listing Policy using the E. coli objective. Two (2) lines of evidence area available in the administrative record to assess this pollutant for the REC-1 beneficial use. Zero out of 35 samples exceed the 6-week E.Coli Geomean Objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero (0) of the 35 samples exceed the E. Coli Geomean Objective for the REC-1 beneficial use and this does not exceed the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. In accordance with section 6.1.5.3 of the Listing Policy, data should be representative of the critical timing that the pollutant is expected to impact the waterbody. Indicator bacteria (total coliform, fecal coliform, E. coli, enterococci) populations may fluctuate substantially on a daily, seasonal, or yearly basis. Lacking constant inputs, they do not persist in the environment for a long period and effects are of relatively short duration. As a result, the historic levels of indicator bacteria in the waterbody may be a poor indicator of current risks to human health, particularly when more recent data are available to sufficiently assess the water quality standard. Additionally, water quality conditions in waterbodies may change as a result of management actions that have been implemented to address bacteria. Unrepresentative data may result in incorrectly placing or not placing a water body segment on the list, which could result in the unnecessary expenditure of public resources or failure to address a human health risk. Historic lines of evidence for data collected prior to 2010 were evaluated pursuant to these considerations and were not used to assess water quality standards attainment because they do not meet the temporal representation requirements of section 6.1.5.3 of the Listing Policy. For E.Coli data, Listing Policy sections 3.3 and 4.3 instructs to use the binomial distribution table in sections 3.2 and 4.2, as applicable. To use the binomial table that uses a four percent exceedance frequency, the data must be collected from coastal beaches or inland surface waters from April 1 through October 31 only, and where collected from inland waters from April 1 through October 31 only, bacterial measurements must be indicative of human fecal matter, and there is substantial human contact in the waterbody. The language below is from a previous cycle. This 303(d) listing was made prior to 2006 and therefore the data is not held in the assessment database. A review of Regional Board records indicate that in 1987, fecal coliform results for lake samples adjacent to historical campgrounds that had no toilet facilities were as high as 900 org/100mL and the campgrounds were closed in the intervening years. In 2012, the Regional Board revised its Basin Plan with new Pathogen Bacteria Indicator Objectives for REC-1(Resolution No. R8-2012-001, approved by USEPA in 2015). In general, the primary objective is <126 E. coli organisms per 100 mL as a geomean of at least 5 samples in a running 30-day period (there were additional provisions for specific waters through UAAs, a high flow suspension provision and use of Single Sample Maximums for posting and for the case where limited data prevents the calculation of geomeans. During 2009, a total of 309 samples were collected from Canyon Lake (6 sampling locations) and were analyzed for E. coli, which resulted in the calculation of 14 geomeans for each of the 6 sampling locations, or 84 geomean measurements. The maximum geomean value was 39.4 org/100mL, well below the current objective for Indicator Pathogen Bacteria. Therefore, Regional Board staff has made the decision to delist Canyon Lake for Pathogens based on a change in objectives from <200 fecal coliform organisms per 100 mL to <126 E. coli organisms per 100 mL. Further, Regional Board staff judge that the weight of evidence based on extensive, current sampling support that delisting decision.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be removed from the section 303(d) list because applicable water quality standards for the pollutant are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:	The language below is from a previous cycle. This 303(d) listing was made prior to 2006 and therefore the data is not held in the assessment database. A review of Regional Board records indicate that in 1987, fecal coliform results for lake samples adjacent to historical campgrounds that had no toilet facilities were as high as 900 org/100mL and the campgrounds were closed in the intervening years. In 2012, the Regional Board revised its Basin Plan with new Pathogen Bacteria Indicator Objectives for REC-1(Resolution No. R8-2012-001, approved by USEPA in 2015). In general, the primary objective is <126 E. coli organisms per 100 mL as a geomean of at least 5 samples in a running 30-day period (there were additional provisions for specific waters through UAAs, a high flow suspension provision and use of Single Sample Maximums for posting and for the case where limited data prevents the calculation of geomeans. During 2009, a total of 309 samples were collected from Canyon Lake (6 sampling locations) and were analyzed for E. coli, which resulted in the calculation of 14 geomeans for each of the 6 sampling locations, or 84 geomean measurements. The maximum geomean value was 39.4 org/100mL, well below the current objective for Indicator Pathogen Bacteria. Therefore, Regional Board staff has made the decision to delist Canyon Lake for Pathogens based on a change in objectives from <200 fecal coliform organisms per 100 mL to <126 E. coli organisms per 100 mL. Further, Regional Board staff judge that the weight of evidence based on extensive, current sampling support that delisting decision.

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 149137, Indicator Bacteria	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

301019

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

GeoMean

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Santa Ana River Regional Monitoring Program data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and the results are as follows: 0 of the 35 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bacteria water quality objective to protect the REC-1 beneficial use for waters where the salinity is equal to or less than 1 part per thousand 95 percent or more of the time applies a rolling six-week geometric mean of E. coli, not to exceed 100 cfu/100 mL (ISWEBE 2018).

Objective/Criterion Reference:

Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): P1-1 (Canyon Lake at Holiday Harbor).

Temporal Representation:

The samples were collected between the days of 2016-05-12 and 2020-09-23 .

Environmental Conditions:

QAPP Information:

CDM Smith. 2019. Santa Ana River Watershed Bacteria Monitoring Program.

QAPP Information Reference(s):

Santa Ana River Watershed Bacteria Monitoring Program

Line of Evidence (LOE) for Decision ID 149137, Indicator Bacteria	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

301004

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

STV

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Santa Ana River Regional Monitoring Program data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and the results are as follows: 0 of the 25 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bacteria water quality objective to protect the REC-1 beneficial use where the salinity is less than 1 parts per thousand 95 percent or more of the time applies a statistical threshold value to E. coli of 320 cfu/100 mL, not to be exceeded by more than 10 percent of samples within a calendar month (ISWEBE 2018).

Objective/Criterion Reference:

Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): P1-1 (Canyon Lake at Holiday Harbor).

Temporal Representation:

The samples were collected between the days of 2016-05-12 and 2020-09-23 .

Environmental Conditions:

QAPP Information:

CDM Smith. 2019. Santa Ana River Watershed Bacteria Monitoring Program.

QAPP Information Reference(s):

Santa Ana River Watershed Bacteria Monitoring Program

Line of Evidence (LOE) for Decision ID 149137, Indicator Bacteria	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

96008

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Zero of the 84 geomeans exceeded the E. coli objective.

Data Reference:

Canyon Lake Bacteria Characterization - Water quality assessment-data analysis notes- Canyon Lake, Riverside County,Santa Ana Regional Quality Control Board

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The running geometric mean of at least 5 samples in a 30-day period shall be less than 126 E. coli organisms per 100 mL. 2015 Water Quality Control Plan for the Santa Ana River Basin.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from 6 locations, 2 open water locations based on skiing and boat use and from 4 beaches: Roadrunner Park, Indian Beach, Sunset Park and Sierra Park.

Temporal Representation:

The samples were collected weekly from 1/30/2009 through 3/20/2009 and from 6/5/2009 through 9/4/2009.

Environmental Conditions:

QAPP Information:

Sampling and analysis was conducted in compliance with the Comprehensive Quality Assurance Manual - Version 31- For MWH Laboratories

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 149137, Indicator Bacteria	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

4405

Pollutant:

Pathogens

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

Placeholder reference pre-2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Unspecified

Objective/Criterion Reference:

Placeholder reference pre-2006 303(d)

Evaluation Guideline:

Unspecified

Guideline Reference:

Placeholder reference pre-2006 303(d)

Spatial Representation:

Unspecified

Temporal Representation:

Unspecified

Environmental Conditions:

Unspecified

QAPP Information:

Unspecified

QAPP Information Reference(s):


DECISION ID	132512	Region 8
Canyon Lake (Railroad Canyon Reservoir)

Pollutant:	Aluminum
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	During 2024 cycle, the 1988 National Recommended Water Quality Criteria used to assess aluminum data was replaced with U.S. EPA’s 2018 Final Recommended Aquatic Life Criteria for Aluminum in Freshwater. This pollutant is being considered for placement on the CWA section 303(d) List under sections 3.1 and 3.11 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. 16 lines of evidence are available in the administrative record to assess this pollutant. Four of 11 samples exceed the evaluation guideline for the aquatic life beneficial use. The four samples that exceeded the criteria were collected on the same day (2/2/2017) following a major rain event with rainfall totals of 2-7 inches over the coast and valleys that impacted Canyon Lake from 1/19/2017 to 1/24/2017 (NOAA). Therefore, pursuant to section 6.1.5 of the Listing Policy, environmental conditions in a waterbody or at a site must be taken into consideration and documented. These sampling locations did not have site specific pH data associated with them to complete the calculation of the aluminum criteria. When pH data were not available, the median pH value for the ecoregion was used as a comparable surrogate. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Four of 11 samples (total fraction) exceed the evaluation guideline for the aquatic life beneficial use, and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. The four samples that exceeded the criteria were collected on the same day (2/2/2017) following a major rain event with rainfall totals of 2-7 inches over the coast and valleys that impacted Canyon Lake from 1/19/2017 to 1/24/2017 (NOAA). Therefore, pursuant to section 6.1.5 of the Listing Policy, environmental conditions in a waterbody or at a site must be taken into consideration and documented. Other data submitted, not under the influence of a major storm event, did not indicate impairment of Canyon Lake for aluminum. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not being met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 132512, Aluminum	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

307223

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 1 of 3 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The aluminum criterion for the protection of aquatic life, is pH, total hardness, and dissolved organic carbon (DOC) dependent. When total hardness or DOC data were not available, default values based on the level III ecoregions developed by U.S EPA were substituted (EPA, 2018). When pH data were not available, the median pH value for the ecoregion, a pH value from a comparable waterbody, or a pH value from a local study in the same waterbody was used as a comparable surrogate.

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL08 (Canyon Lake 8).

Temporal Representation:

The samples were collected between the dates of 2016-10-05 and 2017-04-07

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132512, Aluminum	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

307268

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL10 (Canyon Lake 10).

Temporal Representation:

The samples were collected between the dates of 2016-09-19 and 2017-02-02

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132512, Aluminum	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

235098

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The concentrations of contaminants in waters which are existing or potential sources of drinking water shall not occur at levels that are harmful to human health (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The California Maximum Contaminant Level for Aluminum is 1 mg/L (California Code of Regulations, Title 22).

Guideline Reference:

California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL07 (Canyon Lake 7).

Temporal Representation:

The samples were collected between the dates of 2016-10-05 and 2017-04-07

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132512, Aluminum	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

235103

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The California Maximum Contaminant Level for Aluminum is 1 mg/L (California Code of Regulations, Title 22).

Guideline Reference:

California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL09 (Canyon Lake 9).

Temporal Representation:

The samples were collected between the dates of 2016-10-05 and 2017-04-07

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132512, Aluminum	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

235102

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 1 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The California Maximum Contaminant Level for Aluminum is 1 mg/L (California Code of Regulations, Title 22).

Guideline Reference:

California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL09 (Canyon Lake 9).

Temporal Representation:

The samples were collected between the dates of 2016-10-05 and 2017-02-02

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132512, Aluminum	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

235111

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The California Maximum Contaminant Level for Aluminum is 1 mg/L (California Code of Regulations, Title 22).

Guideline Reference:

California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL08 (Canyon Lake 8).

Temporal Representation:

The samples were collected between the dates of 2016-10-05 and 2017-04-07

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132512, Aluminum	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

235108

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The California Maximum Contaminant Level for Aluminum is 1 mg/L (California Code of Regulations, Title 22).

Guideline Reference:

California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL10 (Canyon Lake 10).

Temporal Representation:

The samples were collected between the dates of 2016-09-19 and 2017-02-02

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132512, Aluminum	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

235110

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The California Maximum Contaminant Level for Aluminum is 1 mg/L (California Code of Regulations, Title 22).

Guideline Reference:

California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL07 (Canyon Lake 7).

Temporal Representation:

The samples were collected between the dates of 2016-10-05 and 2017-04-07

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132512, Aluminum	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

235113

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The California Maximum Contaminant Level for Aluminum is 1 mg/L (California Code of Regulations, Title 22).

Guideline Reference:

California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL08 (Canyon Lake 8).

Temporal Representation:

The samples were collected between the dates of 2016-10-05 and 2017-04-07

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132512, Aluminum	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

307225

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL10 (Canyon Lake 10).

Temporal Representation:

The samples were collected between the dates of 2016-10-05 and 2016-10-05

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132512, Aluminum	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

307228

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL08 (Canyon Lake 8).

Temporal Representation:

The samples were collected between the dates of 2016-10-05 and 2017-04-07

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132512, Aluminum	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

307288

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL07 (Canyon Lake 7).

Temporal Representation:

The samples were collected between the dates of 2016-10-05 and 2017-04-07

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132512, Aluminum	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

307285

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL07 (Canyon Lake 7).

Temporal Representation:

The samples were collected between the dates of 2016-10-05 and 2017-04-07

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132512, Aluminum	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

307274

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL09 (Canyon Lake 9).

Temporal Representation:

The samples were collected between the dates of 2016-10-05 and 2017-04-07

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132512, Aluminum	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

307280

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 1 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL09 (Canyon Lake 9).

Temporal Representation:

The samples were collected between the dates of 2016-10-05 and 2017-02-02

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132512, Aluminum	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

235118

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The California Maximum Contaminant Level for Aluminum is 1 mg/L (California Code of Regulations, Title 22).

Guideline Reference:

California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL10 (Canyon Lake 10).

Temporal Representation:

The samples were collected between the dates of 2016-10-05 and 2016-10-05

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority


DECISION ID	152002	Region 8
Canyon Lake (Railroad Canyon Reservoir)

Pollutant:	Anatoxin-A
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 152002, Anatoxin-A	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308910

Pollutant:

Anatoxin-A

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Freshwater Harmful Algal Blooms(HAB) Program data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A.

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 20 ug/L of anatoxin-A as the water concentration protective of swimmers and other contact recreational users including water-skiing/jet-skiing, fishing, boating, sail boarding, and canoeing.

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLVDN (Canyon Lake, Vacation Drive Causeway North).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152002, Anatoxin-A	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308670

Pollutant:

Anatoxin-A

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L.

Guideline Reference:

Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority

Spatial Representation:

The samples were collected at 1 monitoring site: 802SSCL01 (Canyon Lake near Railroad Canyon Road).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152002, Anatoxin-A	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308877

Pollutant:

Anatoxin-A

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLRPS1 (Canyon Lake, Roadrunner Park-Swim Beach).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152002, Anatoxin-A	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308657

Pollutant:

Anatoxin-A

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLSBS1 (Canyon Lake, Sunset Beach-Swim Beach).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152002, Anatoxin-A	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308824

Pollutant:

Anatoxin-A

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLVDS (Canyon Lake, Vacation Drive Causeway South).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152002, Anatoxin-A	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308891

Pollutant:

Anatoxin-A

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 802SSCL01 (Canyon Lake near Railroad Canyon Road).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152002, Anatoxin-A	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308689

Pollutant:

Anatoxin-A

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L.

Guideline Reference:

Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLVDS (Canyon Lake, Vacation Drive Causeway South).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152002, Anatoxin-A	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308655

Pollutant:

Anatoxin-A

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L.

Guideline Reference:

Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLVDN (Canyon Lake, Vacation Drive Causeway North).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152002, Anatoxin-A	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308671

Pollutant:

Anatoxin-A

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L.

Guideline Reference:

Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLSBS1 (Canyon Lake, Sunset Beach-Swim Beach).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152002, Anatoxin-A	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308673

Pollutant:

Anatoxin-A

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L.

Guideline Reference:

Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLRPS1 (Canyon Lake, Roadrunner Park-Swim Beach).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.


DECISION ID	152878	Region 8
Canyon Lake (Railroad Canyon Reservoir)

Pollutant:	Cylindrospermopsin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 152878, Cylindrospermopsin	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308695

Pollutant:

Cylindrospermopsin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 4 ug/L of cylindrospermopsin as the water concentration protective of swimmers and other contact recreational users including water-skiing/jet-skiing, fishing, boating, sail boarding, and canoeing.

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLSBS1 (Canyon Lake, Sunset Beach-Swim Beach).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152878, Cylindrospermopsin	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308809

Pollutant:

Cylindrospermopsin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLRPS1 (Canyon Lake, Roadrunner Park-Swim Beach).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152878, Cylindrospermopsin	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308678

Pollutant:

Cylindrospermopsin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

USEPA 10-day cylindrospermopsin health advisory for bottle-fed infants and young children of pre-school age is 0.7 ug/L.

Guideline Reference:

Drinking Water Health Advisory for the Cyanobacterial Microcystin Toxins

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLRPS1 (Canyon Lake, Roadrunner Park-Swim Beach).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152878, Cylindrospermopsin	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308743

Pollutant:

Cylindrospermopsin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLVDN (Canyon Lake, Vacation Drive Causeway North).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152878, Cylindrospermopsin	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308696

Pollutant:

Cylindrospermopsin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLVDS (Canyon Lake, Vacation Drive Causeway South).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152878, Cylindrospermopsin	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308796

Pollutant:

Cylindrospermopsin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

USEPA 10-day cylindrospermopsin health advisory for bottle-fed infants and young children of pre-school age is 0.7 ug/L.

Guideline Reference:

Drinking Water Health Advisory for the Cyanobacterial Microcystin Toxins

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLSBS1 (Canyon Lake, Sunset Beach-Swim Beach).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152878, Cylindrospermopsin	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308845

Pollutant:

Cylindrospermopsin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

USEPA 10-day cylindrospermopsin health advisory for bottle-fed infants and young children of pre-school age is 0.7 ug/L.

Guideline Reference:

Drinking Water Health Advisory for the Cyanobacterial Microcystin Toxins

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLVDN (Canyon Lake, Vacation Drive Causeway North).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152878, Cylindrospermopsin	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308811

Pollutant:

Cylindrospermopsin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

USEPA 10-day cylindrospermopsin health advisory for bottle-fed infants and young children of pre-school age is 0.7 ug/L.

Guideline Reference:

Drinking Water Health Advisory for the Cyanobacterial Microcystin Toxins

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLVDS (Canyon Lake, Vacation Drive Causeway South).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.


DECISION ID	152879	Region 8
Canyon Lake (Railroad Canyon Reservoir)

Pollutant:	Microcystins
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 152879, Microcystins	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308682

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

USEPA 10-day microcystin health advisory for bottle-fed infants and young children of pre-school age is 0.3 ug/L.

Guideline Reference:

Drinking Water Health Advisory for the Cyanobacterial Microcystin Toxins

Spatial Representation:

The samples were collected at 1 monitoring site: 802SSCL01 (Canyon Lake near Railroad Canyon Road).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152879, Microcystins	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308903

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

California Office of Environmental Health Hazard Assessment (OEHHA) established 2 ug/L of microcystins as the subchronic water concentration for dog intake/ingestion (Office of Environmental Health Hazard Assessment Public Health Action Level for microcystin and Human Recreational Uses (May 2012)). OEHHA Action Level for subchronic water intake, dog.

Guideline Reference:

Toxicological Summary and Suggested Action Levels to Reduce Potential Adverse Health Effects of Six Cyanotoxins

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLVDS (Canyon Lake, Vacation Drive Causeway South).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152879, Microcystins	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308838

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

USEPA 10-day microcystin health advisory for bottle-fed infants and young children of pre-school age is 0.3 ug/L.

Guideline Reference:

Drinking Water Health Advisory for the Cyanobacterial Microcystin Toxins

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLVDN (Canyon Lake, Vacation Drive Causeway North).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152879, Microcystins	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308665

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

USEPA 10-day microcystin health advisory for bottle-fed infants and young children of pre-school age is 0.3 ug/L.

Guideline Reference:

Drinking Water Health Advisory for the Cyanobacterial Microcystin Toxins

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLVDS (Canyon Lake, Vacation Drive Causeway South).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152879, Microcystins	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308816

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 6 ug/L of microcystins as the water concentration protective of swimmers and other contact recreational users including water-skiing/jet-skiing, fishing, boating, sail boarding, and canoeing.

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLSBS1 (Canyon Lake, Sunset Beach-Swim Beach).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152879, Microcystins	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308730

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Toxicological Summary and Suggested Action Levels to Reduce Potential Adverse Health Effects of Six Cyanotoxins

Spatial Representation:

The samples were collected at 1 monitoring site: 802SSCL01 (Canyon Lake near Railroad Canyon Road).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152879, Microcystins	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308832

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLRPS1 (Canyon Lake, Roadrunner Park-Swim Beach).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152879, Microcystins	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308769

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

USEPA 10-day microcystin health advisory for bottle-fed infants and young children of pre-school age is 0.3 ug/L.

Guideline Reference:

Drinking Water Health Advisory for the Cyanobacterial Microcystin Toxins

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLRPS1 (Canyon Lake, Roadrunner Park-Swim Beach).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152879, Microcystins	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308870

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

USEPA 10-day microcystin health advisory for bottle-fed infants and young children of pre-school age is 0.3 ug/L.

Guideline Reference:

Drinking Water Health Advisory for the Cyanobacterial Microcystin Toxins

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLSBS1 (Canyon Lake, Sunset Beach-Swim Beach).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152879, Microcystins	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308714

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Toxicological Summary and Suggested Action Levels to Reduce Potential Adverse Health Effects of Six Cyanotoxins

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLVDN (Canyon Lake, Vacation Drive Causeway North).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152879, Microcystins	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308711

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLVDS (Canyon Lake, Vacation Drive Causeway South).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152879, Microcystins	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308728

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Toxicological Summary and Suggested Action Levels to Reduce Potential Adverse Health Effects of Six Cyanotoxins

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLSBS1 (Canyon Lake, Sunset Beach-Swim Beach).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152879, Microcystins	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308710

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Toxicological Summary and Suggested Action Levels to Reduce Potential Adverse Health Effects of Six Cyanotoxins

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLRPS1 (Canyon Lake, Roadrunner Park-Swim Beach).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152879, Microcystins	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308747

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLVDN (Canyon Lake, Vacation Drive Causeway North).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152879, Microcystins	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308680

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 802SSCL01 (Canyon Lake near Railroad Canyon Road).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.


DECISION ID	150679	Region 8
Canyon Lake (Railroad Canyon Reservoir)

Pollutant:	Nitrogen, Nitrate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 150679, Nitrogen, Nitrate	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

236667

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Nitrate-nitrogen concentrations shall not exceed 10 mg/L (as N) in inland surface waters designated MUN as a result of controllable water quality factors (Water Quality Control Plan, Santa Ana Basin, Chapter 4 Water Quality Objectives, Inland Surface Waters).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL10 (Canyon Lake 10).

Temporal Representation:

The samples were collected between the dates of 2016-02-08 and 2020-04-13

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 150679, Nitrogen, Nitrate	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

236668

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL09 (Canyon Lake 9).

Temporal Representation:

The samples were collected between the dates of 2017-02-02 and 2017-02-02

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 150679, Nitrogen, Nitrate	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

236492

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL07 (Canyon Lake 7).

Temporal Representation:

The samples were collected between the dates of 2016-02-08 and 2018-06-05

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 150679, Nitrogen, Nitrate	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

236538

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL08 (Canyon Lake 8).

Temporal Representation:

The samples were collected between the dates of 2016-02-08 and 2017-04-07

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority


DECISION ID	150640	Region 8
Canyon Lake (Railroad Canyon Reservoir)

Pollutant:	Nitrogen, Nitrite
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 150640, Nitrogen, Nitrite	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

236869

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The California Maximum Contaminant Level for nitrite (as N) is 1.0 mg/L (Title 22 of the California Code of Regulations).

Guideline Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL07 (Canyon Lake 7).

Temporal Representation:

The samples were collected between the dates of 2017-04-07 and 2017-04-07

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 150640, Nitrogen, Nitrite	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

236846

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The California Maximum Contaminant Level for nitrite (as N) is 1.0 mg/L (Title 22 of the California Code of Regulations).

Guideline Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL08 (Canyon Lake 8).

Temporal Representation:

The samples were collected between the dates of 2017-04-07 and 2017-04-07

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 150640, Nitrogen, Nitrite	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

236797

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The California Maximum Contaminant Level for nitrite (as N) is 1.0 mg/L (Title 22 of the California Code of Regulations).

Guideline Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL10 (Canyon Lake 10).

Temporal Representation:

The samples were collected between the dates of 2017-04-07 and 2017-04-07

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 150640, Nitrogen, Nitrite	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

236890

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The California Maximum Contaminant Level for nitrite (as N) is 1.0 mg/L (Title 22 of the California Code of Regulations).

Guideline Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL09 (Canyon Lake 9).

Temporal Representation:

The samples were collected between the dates of 2017-04-07 and 2017-04-07

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority


DECISION ID	152001	Region 8
Canyon Lake (Railroad Canyon Reservoir)

Pollutant:	Saxitoxins
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 152001, Saxitoxins	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308945

Pollutant:

Saxitoxins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The evaluation guideline for saxitoxins for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.3 ug/L.

Guideline Reference:

Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLRPS1 (Canyon Lake, Roadrunner Park-Swim Beach).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152001, Saxitoxins	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308935

Pollutant:

Saxitoxins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The evaluation guideline for saxitoxins for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.3 ug/L.

Guideline Reference:

Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLVDS (Canyon Lake, Vacation Drive Causeway South).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152001, Saxitoxins	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308946

Pollutant:

Saxitoxins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The evaluation guideline for saxitoxins for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.3 ug/L.

Guideline Reference:

Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority

Spatial Representation:

The samples were collected at 1 monitoring site: 802SSCL01 (Canyon Lake near Railroad Canyon Road).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152001, Saxitoxins	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308948

Pollutant:

Saxitoxins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The evaluation guideline for saxitoxins for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.3 ug/L.

Guideline Reference:

Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLVDN (Canyon Lake, Vacation Drive Causeway North).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 152001, Saxitoxins	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

308938

Pollutant:

Saxitoxins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The evaluation guideline for saxitoxins for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.3 ug/L.

Guideline Reference:

Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority

Spatial Representation:

The samples were collected at 1 monitoring site: 802CLSBS1 (Canyon Lake, Sunset Beach-Swim Beach).

Temporal Representation:

The samples were collected between the dates of 2020-09-23 and 2020-09-23

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.


DECISION ID	132510	Region 8
Canyon Lake (Railroad Canyon Reservoir)

Pollutant:	Temperature, water
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for conventional or other pollutants (Table 3.2 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 132510, Temperature, water	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

237698

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 44 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The temperature of waters designated WARM shall not be raised above 90 degrees F June through October or above 78 degrees F during the rest of the year as a result of controllable water quality factors (Water Quality Control Plan, Santa Ana Basin, Chapter 4 Water Quality Objectives, Inland Surface Waters).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL08 (Canyon Lake 8).

Temporal Representation:

The samples were collected between the dates of 2010-09-17 and 2020-08-13

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132510, Temperature, water	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

237929

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL09 (Canyon Lake 9).

Temporal Representation:

The samples were collected between the dates of 2010-09-17 and 2020-08-13

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132510, Temperature, water	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

237785

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 44 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL07 (Canyon Lake 7).

Temporal Representation:

The samples were collected between the dates of 2010-09-17 and 2020-08-13

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132510, Temperature, water	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

237716

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL10 (Canyon Lake 10).

Temporal Representation:

The samples were collected between the dates of 2010-09-17 and 2020-08-13

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132510, Temperature, water	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

237764

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Santa Ana River Regional Monitoring Program data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 54 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: P1-1 (Canyon Lake at Holiday Harbor).

Temporal Representation:

The samples were collected between the dates of 2016-05-19 and 2019-11-25

Environmental Conditions:

QAPP Information:

CDM Smith. 2019. Santa Ana River Watershed Bacteria Monitoring Program.

QAPP Information Reference(s):

Santa Ana River Watershed Bacteria Monitoring Program


DECISION ID	132511	Region 8
Canyon Lake (Railroad Canyon Reservoir)

Pollutant:	Total Dissolved Solids
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Four lines of evidence are available in the administrative record to assess this pollutant. 29 of the 92 samples exceed the WARM Total Dissolved Solids objective. The Water Board has not yet undertaken the evaluation of information in the Integrated Report record to determine that the exceedances are the result of controllable water quality factors, which means there is insufficient information to conclude the objectives are exceeded as a result of controllable water quality factors. However, the number of exceedances out of the number of samples, using the Listing Policy binomial distribution, indicate beneficial uses may be potentially threatened. Therefore, as an interim approach until waterbody-specific information on controllable water quality factors is evaluated or added to the record, the weight of evidence indicates that there is sufficient justification against placing this waterbody-pollutant combination on the CWA Section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 29 of the 92 samples exceed the WARM Total Dissolved Solids objective and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. 5. Pursuant to page 4-10 of the Santa Ana Water Board Basin Plan: The dissolved mineral content of the waters of the region, as measured by the total dissolved solids test (“Standard Methods for the Examination of Water and Wastewater, 16th Ed.,” 1985: 209B (180°C), p. 95), shall not exceed the specific objectives listed in Table 4-1 as a result of controllable water quality factors.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list and instead placed in Category 3 because waterbody-specific information on controllable water quality factors has not been evaluated or added to the record.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list and instead placed in Category 3 because waterbody-specific information on controllable water quality factors has not been evaluated or added to the record.

Line of Evidence (LOE) for Decision ID 132511, Total Dissolved Solids	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

240068

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 2 of 17 samples exceeded the water quality standard for Total Dissolved Solids.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Site-Specific Objective: The concentration of Total Dissolved Solids shall not exceed 700 mg/L in this waterbody (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (802CL09)

Temporal Representation:

The samples were collected between the dates of 2016-09-19 and 2020-08-13

Environmental Conditions:

QAPP Information:

LECL nutrient TMDL

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132511, Total Dissolved Solids	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

240067

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 10 of 25 samples exceeded the water quality standard for Total Dissolved Solids.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Site-Specific Objective: The concentration of Total Dissolved Solids shall not exceed 700 mg/L in this waterbody (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (802CL10)

Temporal Representation:

The samples were collected between the dates of 2015-07-31 and 2020-08-13

Environmental Conditions:

QAPP Information:

LECL nutrient TMDL

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132511, Total Dissolved Solids	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

239956

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 8 of 25 samples exceeded the water quality standard for Total Dissolved Solids.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Site-Specific Objective: The concentration of Total Dissolved Solids shall not exceed 700 mg/L in this waterbody (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (802CL08)

Temporal Representation:

The samples were collected between the dates of 2015-07-31 and 2020-08-13

Environmental Conditions:

QAPP Information:

LECL nutrient TMDL

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132511, Total Dissolved Solids	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

240069

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 9 of 25 samples exceeded the water quality standard for Total Dissolved Solids.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Site-Specific Objective: The concentration of Total Dissolved Solids shall not exceed 700 mg/L in this waterbody (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (802CL07)

Temporal Representation:

The samples were collected between the dates of 2015-07-31 and 2020-08-13

Environmental Conditions:

QAPP Information:

LECL nutrient TMDL

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority


DECISION ID	132509	Region 8
Canyon Lake (Railroad Canyon Reservoir)

Pollutant:	pH
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Five lines of evidence are available in the administrative record to assess this pollutant. 59 of the 210 samples exceed the WARM pH objective. The Water Board has not yet undertaken the evaluation of information in the Integrated Report record to determine that the exceedances are the result of controllable water quality factors, which means there is insufficient information to conclude the objectives are exceeded as a result of controllable water quality factors. However, the number of exceedances out of the number of samples, using the Listing Policy binomial distribution, indicate beneficial uses may be potentially threatened. Therefore, as an interim approach until waterbody-specific information on controllable water quality factors is evaluated or added to the record, the weight of evidence indicates that there is sufficient justification against placing this waterbody-pollutant combination on the CWA Section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 59 of the 210 samples exceed the WARM pH objective and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. 5. Pursuant to page 4-18 of the Santa Ana Water Board Basin Plan: The pH of inland surface waters shall not be raised above 8.5 or depressed below 6.5 as a result of controllable water quality factors.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list and instead placed in Category 3 because waterbody-specific information on controllable water quality factors has not been evaluated or added to the record.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list and instead placed in Category 3 because waterbody-specific information on controllable water quality factors has not been evaluated or added to the record.

Line of Evidence (LOE) for Decision ID 132509, pH	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

237263

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 44 samples exceeded the water quality threshold for pH.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The pH of inland surface waters shall not be raised above 8.5 or depressed below 6.5 as a result of controllable water quality factors (The Water Quality Control Plan, Santa Ana Basin, Chapter 4 Water Quality Objectives, Inland Surface Waters).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL07 (Canyon Lake 7).

Temporal Representation:

The samples were collected between the dates of 2010-09-17 and 2020-08-13

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132509, pH	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

237284

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Santa Ana River Regional Monitoring Program data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 42 of 54 samples exceeded the water quality threshold for pH.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: P1-1 (Canyon Lake at Holiday Harbor).

Temporal Representation:

The samples were collected between the dates of 2016-05-19 and 2019-11-25

Environmental Conditions:

QAPP Information:

CDM Smith. 2019. Santa Ana River Watershed Bacteria Monitoring Program.

QAPP Information Reference(s):

Santa Ana River Watershed Bacteria Monitoring Program

Line of Evidence (LOE) for Decision ID 132509, pH	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

237373

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality threshold for pH.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL09 (Canyon Lake 9).

Temporal Representation:

The samples were collected between the dates of 2010-09-17 and 2020-08-13

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132509, pH	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

237514

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 1 of 44 samples exceeded the water quality threshold for pH.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL08 (Canyon Lake 8).

Temporal Representation:

The samples were collected between the dates of 2010-09-17 and 2020-08-13

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132509, pH	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

237562

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 16 of 35 samples exceeded the water quality threshold for pH.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL10 (Canyon Lake 10).

Temporal Representation:

The samples were collected between the dates of 2010-09-17 and 2020-08-13

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority


DECISION ID	150569	Region 8
Canyon Lake (Railroad Canyon Reservoir)

Pollutant:	Ammonia
Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	Agriculture-storm runoff \| Contaminated Sediments \| Urban Runoff/Storm Sewers \| Wastewater
TMDL Name:	Lake Elsinore Watershed Nutrient TMDL
TMDL Project Code:	120
Date TMDL Approved by USEPA:	09/30/2005
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. 17 lines of evidence are available in the administrative record to assess this pollutant. Three of the 21 samples exceed the WARM Unionized Ammonia objective (total fraction) and three of the 29 samples exceed the Warm Unionized Ammonia objective (no fraction). Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Three of the 21 samples exceed the WARM Unionized Ammonia objective (total fraction) and three of the 29 samples exceed the Warm Unionized Ammonia objective (no fraction) and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 150569, Ammonia	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

316315

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Ammonia as N, Unionized.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chronic unionized ammonia objectives (expressed as a 4-day average in mg/L) to protect aquatic life in freshwater are pH and temperature dependent and were calculated according to the formulas specified in Table 4-4 of the Water Quality Control Plan for the Santa Ana River Basin.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL08 (Canyon Lake 8).

Temporal Representation:

The samples were collected between the dates of 2019-08-27 and 2020-08-13

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 150569, Ammonia	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

316274

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL09 (Canyon Lake 9).

Temporal Representation:

The samples were collected between the dates of 2016-09-19 and 2017-12-05

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 150569, Ammonia	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

235175

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to ammonia as a drinking water level is a concentration of 30 mg/L. This Advisory Level is defined as 'the concentration of a chemical in drinking water that is not expected to cause any adverse noncarcinogenic effects for up to ten days of exposure.

Guideline Reference:

2018 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL08 (Canyon Lake 8).

Temporal Representation:

The samples were collected between the dates of 2015-07-31 and 2018-06-05

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 150569, Ammonia	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

235233

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

2018 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL07 (Canyon Lake 7).

Temporal Representation:

The samples were collected between the dates of 2015-07-31 and 2018-06-05

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 150569, Ammonia	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

235341

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

2018 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL09 (Canyon Lake 9).

Temporal Representation:

The samples were collected between the dates of 2019-08-27 and 2020-08-13

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 150569, Ammonia	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

235203

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

2018 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL10 (Canyon Lake 10).

Temporal Representation:

The samples were collected between the dates of 2020-06-26 and 2020-06-26

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 150569, Ammonia	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

235234

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

2018 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL10 (Canyon Lake 10).

Temporal Representation:

The samples were collected between the dates of 2015-07-31 and 2017-04-07

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 150569, Ammonia	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

235279

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

2018 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL08 (Canyon Lake 8).

Temporal Representation:

The samples were collected between the dates of 2019-08-27 and 2020-08-13

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 150569, Ammonia	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

235195

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

2018 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL09 (Canyon Lake 9).

Temporal Representation:

The samples were collected between the dates of 2016-09-19 and 2018-02-23

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 150569, Ammonia	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

316303

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 2 of 13 samples exceeded the water quality threshold for Ammonia as N, Unionized.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL07 (Canyon Lake 7).

Temporal Representation:

The samples were collected between the dates of 2015-07-31 and 2018-06-05

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 150569, Ammonia	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

316340

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 9 samples exceeded the water quality threshold for Ammonia as N, Unionized.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL08 (Canyon Lake 8).

Temporal Representation:

The samples were collected between the dates of 2015-07-31 and 2018-06-05

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 150569, Ammonia	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

316296

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 2 of 6 samples exceeded the water quality threshold for Ammonia as N, Unionized.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL09 (Canyon Lake 9).

Temporal Representation:

The samples were collected between the dates of 2019-08-27 and 2020-08-13

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 150569, Ammonia	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

235278

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

2018 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL07 (Canyon Lake 7).

Temporal Representation:

The samples were collected between the dates of 2019-08-27 and 2020-08-13

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 150569, Ammonia	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

316356

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 1 of 7 samples exceeded the water quality threshold for Ammonia as N, Unionized.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL07 (Canyon Lake 7).

Temporal Representation:

The samples were collected between the dates of 2019-08-27 and 2020-08-13

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 150569, Ammonia	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

316362

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N, Unionized.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL10 (Canyon Lake 10).

Temporal Representation:

The samples were collected between the dates of 2020-06-26 and 2020-06-26

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 150569, Ammonia	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

316349

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Ammonia as N, Unionized.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL10 (Canyon Lake 10).

Temporal Representation:

The samples were collected between the dates of 2015-07-31 and 2017-02-02

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority


DECISION ID	132508	Region 8
Canyon Lake (Railroad Canyon Reservoir)

Pollutant:	Oxygen, Dissolved
Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	Unknown Nonpoint Source
TMDL Name:	Lake Elsinore Watershed Nutrient TMDL
TMDL Project Code:	120
Date TMDL Approved by USEPA:	09/30/2005
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Six lines of evidence are available in the administrative record to assess this pollutant. One hundred thirty-four of the 271 samples exceed the WARM dissolved oxygen objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One hundred thirty-four of 271 samples exceed the WARM dissolved oxygen objective and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 132508, Oxygen, Dissolved	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

236939

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 28 of 33 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved oxygen content of surface waters shall not be depressed below 5 mg/L for waters designated WARM as a result of controllable water quality factors (Water Quality Control Plan, Santa Ana Basin, Chapter 4 Water Quality Objectives, Inland Surface Waters).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL09 (Canyon Lake 9).

Temporal Representation:

The samples were collected between the dates of 2010-09-10 and 2020-08-13

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132508, Oxygen, Dissolved	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

236872

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Santa Ana River Regional Monitoring Program data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 6 of 50 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: P1-1 (Canyon Lake at Holiday Harbor).

Temporal Representation:

The samples were collected between the dates of 2018-05-10 and 2019-11-25

Environmental Conditions:

QAPP Information:

CDM Smith. 2019. Santa Ana River Watershed Bacteria Monitoring Program.

QAPP Information Reference(s):

Santa Ana River Watershed Bacteria Monitoring Program

Line of Evidence (LOE) for Decision ID 132508, Oxygen, Dissolved	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

236819

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 43 of 48 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL07 (Canyon Lake 7).

Temporal Representation:

The samples were collected between the dates of 2010-09-10 and 2020-08-13

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132508, Oxygen, Dissolved	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

237128

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 44 of 49 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL08 (Canyon Lake 8).

Temporal Representation:

The samples were collected between the dates of 2010-09-10 and 2020-08-13

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority

Line of Evidence (LOE) for Decision ID 132508, Oxygen, Dissolved	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

237087

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Santa Ana River Regional Monitoring Program data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 2 of 50 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: P1-1 (Canyon Lake at Holiday Harbor).

Temporal Representation:

The samples were collected between the dates of 2016-05-12 and 2017-11-30

Environmental Conditions:

QAPP Information:

CDM Smith. 2019. Santa Ana River Watershed Bacteria Monitoring Program.

QAPP Information Reference(s):

Santa Ana River Watershed Bacteria Monitoring Program

Line of Evidence (LOE) for Decision ID 132508, Oxygen, Dissolved	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

236938

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Lake Elsinore & Canyon Lake Nutrient TMDL MP data for Canyon Lake (Railroad Canyon Reservoir) to determine beneficial use support and results are as follows: 11 of 41 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 802CL10 (Canyon Lake 10).

Temporal Representation:

The samples were collected between the dates of 2010-09-10 and 2020-08-13

Environmental Conditions:

QAPP Information:

Wood Environment & Infrastructure Solutions, Inc. 2016. Lake Elsinore & San Jacinto Watershed Project Authority.

QAPP Information Reference(s):

Lake Elsinore & San Jacinto Watershed Project Authority


DECISION ID	99298	Region 8
Canyon Lake (Railroad Canyon Reservoir)

Pollutant:	Fish Kills
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. The one sample may exceed the guideline. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One sample may exceed the guideline but this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to SECTION 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 99298, Fish Kills	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

81358

Pollutant:

Fish Kills

LOE Subgroup:

Adverse Biological Responses

Matrix:

Tissue

Fraction:

Fish whole body

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Incidence of spills and/or fish kills

Data Used to Assess Water Quality:

Approximately 50 to 100 Shad on were observed dead from the shore.

Data Reference:

Data for Various Pollutants in Santa Ana, 2007-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Inland surface water communities and populations, including vertebrate, invertebrate, and plant species, shall not be degraded as a result of the discharge of waste.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Observed fish kills were at Sunset Beach.

Temporal Representation:

The fish kills took place on October 29, 2010.

Environmental Conditions:

The fish kills were attributed to the low dissolved oxygen observed in the lake.

QAPP Information:

Data were provided in a August 2010 report prepared for the Santa Ana Regional Water Quality Control Board called, Lake Elsinore & Canyon Lake Nutrient TMDL Annual Water Quality Report July 2009 June 2010. The report was prepared by Lake Elsinore & Canyon Lake Nutrient TMDL Task Force.

QAPP Information Reference(s):


DECISION ID	69204	Region 8
Canyon Lake (Railroad Canyon Reservoir)

Pollutant:	Nutrients
Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)(2016)
Revision Status	Original
Sources:	Nonpoint Source
TMDL Name:	Lake Elsinore Watershed Nutrient TMDL
TMDL Project Code:	120
Date TMDL Approved by USEPA:	09/30/2005
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	There was no new data considered in the 2014 Listing Cycle, this previously made decision will carryover. The following description applies to an earlier Listing Cycle. This pollutant is being considered for listing under section 2.2 of the Listing Policy. Under this section of the Policy, a minimum of one line of evidence is needed to assess listing status. The Lake Elsinore Watershed Nutrient TMDL was approved by the RWQCB in 2004. Per the RWQCB, the TMDL was approved by USEPA in September 2005. This water segment-pollutant combination was moved off the section 303(d) list during the 2002 listing cycle. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination in the Water Quality Limited Segments Being Addressed portion of the section 303(d) list.

Regional Board Decision Recommendation:	This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current. The decision has not changed.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 69204, Nutrients	Region 8
Canyon Lake (Railroad Canyon Reservoir)

LOE ID:

763

Pollutant:

Nutrients

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):