Draft California 2026 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 1 - North Coast Region

Water Body Name:	Salmon Creek Park (South)
Water Body ID:	CAC1152100020070319160630
Water Body Type:	Coastal & Bay Shoreline


DECISION ID	163033	Region 1
Salmon Creek Park (South)

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; according to new assessment method
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	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. Lacking constant inputs, indicator bacteria do not persist in the environment for a long period and effects are of relatively short duration. As a result, the historic levels of 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. Historic lines of evidence for data collected prior to October 21, 2012, 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. 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. Five lines of evidence are available in the administrative record to assess this pollutant. Geometric means are used to assess the data for the REC-1 beneficial use. Where geometric means are not available, statistical threshold values are used. Geometric means are available for Salmon Creek Park (South) and will be used for the assessment. *DO NOT LIST* For Fecal Coliform, 0 of 1 single sample maximum exceeds the objective for the REC-1 beneficial use, and this is insufficient data to the allowable frequency for AB411 beaches in the Listing Policy. For Enterococcus, 0 of 67 geometric means exceed the objective for the REC-1 beneficial use, and this does not exceed the allowable frequency of AB411 beaches in the the Listing Policy. For Total Coliform, 0 of 12 weekly medians exceed the objective for the SHELL beneficial use, and this exceeds this is insufficient information to apply Table 4.2 of the Listing Policy. For Total Coliform, 0 of 12 monthly percents exceed the objective for the SHELL beneficial use, and this is insufficient information to apply Table 4.2 of the Listing Policy. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for removing this water segment-pollutant combination from 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. For Fecal Coliform, 0 of 1 single sample maximum exceeds the objective for the REC-1 beneficial use, and this is insufficient data to the allowable frequency for AB411 beaches in the Listing Policy. For Enterococcus, 0 of 67 geometric means exceed the objective for the REC-1 beneficial use, and this does not exceed the allowable frequency of AB411 beaches in the the Listing Policy. For Total Coliform, 0 of 12 weekly medians exceed the objective for the SHELL beneficial use, and this exceeds this is insufficient information to apply Table 4.2 of the Listing Policy. For Total Coliform, 0 of 12 monthly percents exceed the objective for the SHELL beneficial use, and this is insufficient information to apply Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 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 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:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 163033, Indicator Bacteria	Region 1
Salmon Creek Park (South)

LOE ID:

353541

Pollutant:

Enterococcus

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 BeachWatch_Sonoma County data to determine beneficial use support and the results are as follows: 0 of the 28 samples exceeded the geomean water quality threshold for Enterococcus. This is a six week rolling geomean that is calculated weekly. This data is for an AB411 beach. This LOE specifically corresponds with dry weather samples and only includes samples collected between April 1 and October 31 of each year.

Data Reference:

Sonoma County Beachwatch data reformatted to match CEDEN fields.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bacteria water quality objective to protect the REC-1 beneficial in ocean waters applies a six-week rolling geomean to enterococcus, not to exceed 30 cfu/100mL. (Ocean Plan 2019)

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): Salmon Creek

Temporal Representation:

Data was assessed for samples collected within 10 years of the close of data solicitation for the 2026 Integrated Report (October 21, 2012 to October 21, 2022).

Environmental Conditions:

QAPP Information:

Data exempt from QAPP requirement. Draft QAPP for Sonoma County Beachwatch data used instead. Represents data collection procedure prior to development of a formal QAPP.

QAPP Information Reference(s):

Draft QAPP for Sonoma County Beachwatch. Represents data collection procedure prior to development of a formal QAPP.

Line of Evidence (LOE) for Decision ID 163033, Indicator Bacteria	Region 1
Salmon Creek Park (South)

LOE ID:

353542

Pollutant:

Enterococcus

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 BeachWatch_Sonoma County data to determine beneficial use support and the results are as follows: 0 of the 39 samples exceeded the geomean water quality threshold for Enterococcus. This is a six week rolling geomean that is calculated weekly. This data is for an AB411 beach. This LOE specifically corresponds with dry weather samples and only includes samples collected between April 1 and October 31 of each year.

Data Reference:

WQ from the BeachWatch for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bacteria water quality objective to protect the REC-1 beneficial in ocean waters applies a six-week rolling geomean to enterococcus, not to exceed 30 cfu/100mL. (Ocean Plan 2019)

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): Salmon Creek

Temporal Representation:

Data was assessed for samples collected within 10 years of the close of data solicitation for the 2026 Integrated Report (October 21, 2012 to October 21, 2022).

Environmental Conditions:

QAPP Information:

QAPP for BeachWatch

QAPP Information Reference(s):

QAPP Reference for Beach Watch Program

Line of Evidence (LOE) for Decision ID 163033, Indicator Bacteria	Region 1
Salmon Creek Park (South)

LOE ID:

353448

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Median

Beneficial Use:

Shellfish Harvesting

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Beachwatch_Sonoma County data to determine beneficial use support and the results are as follows: 0 of the 12 samples exceeded the water quality standard for Total Coliform. The water quality standard for shellfish is based on the median concentration of Total Coliform at each station, and is calculated on a monthly basis.

Data Reference:

Sonoma County Beachwatch data reformatted to match CEDEN fields.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2018) states that the median concentration of total coliform samples shall not exceed 70 per 100 ml.

Objective/Criterion Reference:

California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Salmon Creek.

Temporal Representation:

The samples were assessed for data within 10 years of the close of data solicitation (October 21, 2012 to October 22, 2022).

Environmental Conditions:

QAPP Information:

Data exempt from QAPP requirement. Draft QAPP for Sonoma County Beachwatch data used instead. Represents data collection procedure prior to development of a formal QAPP.

QAPP Information Reference(s):

Draft QAPP for Sonoma County Beachwatch. Represents data collection procedure prior to development of a formal QAPP.

Line of Evidence (LOE) for Decision ID 163033, Indicator Bacteria	Region 1
Salmon Creek Park (South)

LOE ID:

353449

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Percent

Beneficial Use:

Shellfish Harvesting

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Beachwatch_Sonoma County data to determine beneficial use support and the results are as follows: 0 of the 12 samples exceeded the water quality standard for Total Coliform. The water quality standard for shellfish is based on the percent of Total Coliform at each station, and is calculated on a monthly basis.

Data Reference:

Sonoma County Beachwatch data reformatted to match CEDEN fields.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2018) states that not more than 10 percent of the samples shall exceed 230 per 100 mL.

Objective/Criterion Reference:

California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Salmon Creek.

Temporal Representation:

The samples were assessed for data within 10 years of the close of data solicitation (October 21, 2012 to October 22, 2022).

Environmental Conditions:

QAPP Information:

Data exempt from QAPP requirement. Draft QAPP for Sonoma County Beachwatch data used instead. Represents data collection procedure prior to development of a formal QAPP.

QAPP Information Reference(s):

Draft QAPP for Sonoma County Beachwatch. Represents data collection procedure prior to development of a formal QAPP.

Line of Evidence (LOE) for Decision ID 163033, Indicator Bacteria	Region 1
Salmon Creek Park (South)

LOE ID:

321989

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

SSM

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 BeachWatch_Sonoma County data for Salmon Creek Park (South) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the water quality threshold for Coliform, Fecal. The water quality threshold is based on a Single Sample Maximum (SSM) value that is calculated daily. This data is for an AB411 beach. This LOE specifically corresponds with dry weather samples and only includes samples collected between April 1 and October 31 of each year.

Data Reference:

WQ from the BeachWatch for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bacteria water quality objective to protect the REC-1 beneficial use in ocean waters applies a single sample maximum of fecal coliform, not to exceed 400 per 100 mL. (Ocean Plan 2019)

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): Salmon Creek (Salmon Creek-Salmon Creek State Park Beach, Sonoma).

Temporal Representation:

The samples were collected between the days of 2021-06-14 and 2021-06-14 .

Environmental Conditions:

QAPP Information:

QAPP for BeachWatch

QAPP Information Reference(s):

QAPP Reference for Beach Watch Program


DECISION ID	121602	Region 1
Salmon Creek Park (South)

Pollutant:	Trash
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 3.7 of the Listing Policy. One line of evidence is available to assess this pollutant. For trash data, there is no appropriate interpretive evaluation guideline that meets the requirements set forth in Section 6.1.3 of the Listing Policy for ocean beaches in the North Coast Region. Without an appropriate evaluation guideline, it is not possible to determine if the quantity of trash collected on the beach constitutes an exceedance of the trash water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is insufficient information to place this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. It is unknown if the data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. It is unknown if the data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. An evaluation guideline meeting the requirements of Section 6.1.3 of the Listing Policy was unavailable. 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:	This decision was made by SWRCB staff.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWCRB staff conclude that there is insufficient information to place this waterbody-pollutant combination on the 303(d) list.

Line of Evidence (LOE) for Decision ID 121602, Trash	Region 1
Salmon Creek Park (South)

LOE ID:

198736

Pollutant:

Trash

LOE Subgroup:

Pollutant-Nuisance

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Non-Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Volunteers collected trash, categorized the types, and provided the total weight of all trash in pounds, during one-day cleanup events on 09/25/2010, 09/21/2013, and 09/20/2014, with totals of 56, 130, and 60 lbs., respectively. There were counts of numbers of pieces of 41 separate categories of trash (e.g., cigarette butts, bottles, grocery bags).

Data Reference:

Dataset provided by the Center for Biological Diversity. Contains trash data from California Coastal Comission-sponsored beach cleanup days in the North Coast Region at nine sites: Clam Beach County Park, North Jetty/Samoa Dunes Recreation Area, South Jetty/South Spit, Trinidad State Beach, Glass Beach, MacKerricher State Park, Ten Mile Beach, North Salmon Creek Beach, and South Salmon Creek Beach.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Trash shall not be present in ocean waters, along shorelines or adjacent areas in amounts that adversely affect beneficial uses or cause nuisance. (California Ocean Plan, 2019).

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

A single set of coordinates was provided, representing an unspecified area of North Salmon Creek Beach: Latitude, 38.35715; longitude, -123.068.

Temporal Representation:

Samples were taken on three different one-day cleanup events on 09/25/2010, 09/21/2013, and 09/20/2014.

Environmental Conditions:

QAPP Information:

A "Site Captain Guide" document was provided, which included instructions to volunteers for a trash clean-up day. The document does not meet Listing Policy guidelines as a QAPP document.

QAPP Information Reference(s):

Site Captain Guide 2017

Line of Evidence (LOE) for Decision ID 121602, Trash	Region 1
Salmon Creek Park (South)

LOE ID:

214827

Pollutant:

Trash

LOE Subgroup:

Pollutant-Nuisance

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Non-Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Volunteers collected trash, categorized the types, and provided the total weight of all trash in pounds, during one-day cleanup events on 09/25/2010, 09/17/2011, 09/15/2012, 09/21/2013, and 09/20/2014, with totals of 255, 217, 271.5, 31, and 72.25 lbs., respectively. There were counts of numbers of pieces of 41 separate categories of trash (e.g., cigarette butts, bottles, grocery bags).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Trash shall not be present in ocean waters, along shorelines or adjacent areas in amounts that adversely affect beneficial uses or cause nuisance. (California Ocean Plan, 2019).

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

A single set of coordinates was provided, representing an unspecified area of South Salmon Creek Beach: Latitude, 38.34923; longitude, -123.068.

Temporal Representation:

Samples were taken on five different one-day cleanup events on 09/25/2010, 09/17/2011, 09/15/2012, 09/21/2013, and 09/20/2014.

Environmental Conditions:

QAPP Information:

A "Site Captain Guide" document was provided, which included instructions to volunteers for a trash clean-up day. The document does not meet Listing Policy guidelines as a QAPP document.

QAPP Information Reference(s):

Site Captain Guide 2017