California Integrated Report - 303(d) List of Water Quality Limited Segments and 305(b) Condition Report
The federal Clean Water Act (“CWA”) requires that California report on the quality of its surface waterbodies (such as rivers, streams, reservoirs, bays, etc.) every two years. California develops the integrated report to meet this requirement. The integrated report consists of the CWA section 303(d) impaired waters list and the 305(b) condition report. The California Integrated Report is developed in “cycles” with submittal to the U.S. Environmental Protection Agency (“USEPA”) every two years. Each cycle consists of data assessments from waters within three Regional Water Quality Control Board regions. The other six regions may be considered “off-cycle” and assess high-priority data.
Placing a waterbody on the 303(d) list initiates the prioritization of total maximum daily load (“TMDL”) development, or another alternative restoration project, to restore and maintain water quality standards. The USEPA compiles the 305(b) reports from all states, territories, and tribes, and submits the summaries in their “National Water Quality Inventory Report” to the U.S. Congress.
Since the 2020-2022 California Integrated Report cycle, the State Water Resources Control Board (“State Water Board”) has been administering the public process, including board hearings and development of the staff report. While the Regional Water Boards play a significant role in the development of the integrated report, the Regional Water Boards no longer conduct individual board hearings and public comment periods. All public documents are available on the State Water Board Surface Water Quality Assessment program webpage. Introductory information of the California Integrated Report can be found in the Fact Sheet.
To receive email updates from the State Water Board about the integrated report, under their Water Quality tab, please subscribe to their Integrated Report – 303(d)/305(b) email list.
2024 California Integrated Report (Clean Water Act section 303(d) list and 305(b) report
- Partial approval and partial disapproval of the 2024 California Integrated Report from USEPA
- Final 2024 California Integrated Report
- 2024 Integrated Report Map
For the 2024 Integrated Report, the Los Angeles Regional Water Board conducted on-cycle assessments.
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State Water Board Adoption Meeting and Final Integrated Report, Staff Report, and Response to Comments
- Please refer to the State Water Board’s page for documents not seen here. https://www.waterboards.ca.gov/water_issues/programs/water_quality_assessment/2024-integrated-report.html
- Recording of February 6, 2024 Board Meeting (starts 1:50:40) and Item 5 Staff Presentation
- Final Resolution No. 2024-0007 for the Clean Water Act 303(d) List for the 2024 Integrated Report and Resolution Item #12 QAPP Verification Status
- Final Summary of Comments and Reponses for the 2024 California Integrated Report
- Final Revised Staff Report for the 2024 California Integrated Report
- Final Revised Appendix A: Recommended 2024 303(d) List of Impaired Waters
- Final Revised Appendix B: Statewide Waterbody Fact Sheets (HTML version | Excel version)
- Final Appendix V: List of Los Angeles Regional Water Board Decisions Revised Due to Removal of Data Assessed for Incorrect Beneficial Use
- Final Appendix W: List of Los Angeles and Santa Ana Regional Water Boards Decisions Revised Due to Ammonia Reassessments
- Final Appendix X: List of Los Angeles Regional Water Board Decisions Revised Due to Duplicate LOEs in Coyote Creek
2018 California Integrated Report (Clean Water Act Section 303(d) List and 305(b) Report)
- Final 2018 California Integrated Report
- 2018 Integrated Report Map
For the 2018 Integrated Report, the Los Angeles Regional Water Board conducted off-cycle assessments for several water bodies in Ventura County.
- Proposed Revisions to the 303(d) List for Certain Ventura County Beaches
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Proposed Revisions to the 303(d) List for Certain Ventura County Beaches
The Beach Bacteria Data may also be found on the following State Board weblink: https://www.waterboards.ca.gov/water_issues/programs/beaches/search_beach_mon.html
2016 California Integrated Report (Clean Water Act Section 303(d) List and 305(b) Report)
- Additional information on the 303(d) list can be found on State Boards website under Impaired Water Bodies
- The current 303(d) list can be found on the State Water Board website. This is the final 2014/2016 list.
For the 2016 assessment cycle, the Section 303(d) List and Section 305(b) Water Quality Assessment Report are combined into a single "Integrated Report" to satisfy the requirements of both sections of the CWA. The process involves separate actions by Regional Water Boards on recommendations to the State Water Board. The State Water Board will compile and approve a statewide Integrated Report and submit it to the USEPA for final approval.
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Clean Water Act Sections 303(d) and 305(b) Integrated Report for the Los Angeles Region, Revised Public Review Draft - An updated summary of Los Angeles Water Board staff's recommendations.
- Revised Staff Report
- Revised Appendix A - Proposed Updates to the 303(d)
- Revised Appendix B - Category 5 Waterbody Segments
- Revised Appendix C - Category 4c Waterbody Segments
- Revised Appendix D - Category 4b Water Body Segments
- Revised Appendix E - Category 4a Water Body Segments
- Revised Appendix F - Category 3 Water Body Segments
- Revised Appendix G - Category 2 Water Body Segments
- Revised Appendix H - Category 1 Water Body Segments
- Revised Appendix I - Fact Sheets
- Revised Appendix J - References
- Revised Response To Comments
- Comment Letters Received
- Wishtoyo Foundation and Ventura Coastkeeper , March 24, 2017
- City of Rolling Hills Estates, March 28, 2017
- City of Rosemead, March 28, 2017
- City of Compton, March 29, 2017
- City of Redondo Beach, March 29, 2017
- City of Santa Clarita, March 29, 2017
- Farm Bureau of Ventura County, March 29, 2017
- Castaic Lake Water Agency, March 30, 2017
- City of Azusa, March 30, 2017
- City of Gardena, March 30, 2017
- City of Los Angeles LA Sanitation, March 30, 2017
- City of Manhattan Beach, March 30, 2017
- City of Palos Verdes Estates, March 30, 2017
- City of Pomona, March 30, 2017
- City of San Fernando, March 30, 2017
- City of Ventura, March 30, 2017
- County of Los Angeles and Los Angeles County Flood Control District, March 30, 2017
- County of Ventura Public Works Agency, March 30, 2017
- County of Ventura and the Cities of Fillmore and Santa Paula, March 30, 2017
- Department of Water Resources, March 30, 2017
- Earth Law Center, March 30, 2017
- Heal the Bay, March 30, 2017
- Los Angeles Department of Water and Power, March 30, 2017
- Lower Los Angeles River Watershed Committee, March 30, 2017
- Lower San Gabriel River Watershed Committee, March 30, 2017
- Sanitation Districts of Los Angeles County, March 30, 2017
- Santa Barbara Channelkeeper, March 30, 2017
- Sherwood Valley Homeowners Association, March 30, 2017
- Stakeholders Implementing TMDLs in the Calleguas Creek Watershed, March 30, 2017
- TECS Environmental Compliance Services, March 30, 2017
- Ventura County Stormwater Quality Management Committee, March 30, 2017
- Ventura Water Department of the City of San Buenaventura, March 30, 2017
- Response To Comments
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Clean Water Act Sections 303(d) and 305(b) Integrated Report for the Los Angeles Region, Public Review Draft - A summary of Los Angeles Water Board staff's recommendations.
- Staff Report
- Appendix A - Proposed Updates to the 303(d) List
- Appendix B - Category 5 Waterbody Segments
- Appendix C - Category 4a Waterbody Segments
- Appendix D - Category 3 Water Body Segments
- Appendix E - Category 2 Water Body Segments
- Appendix F - Category 1 Water Body Segments
- Appendix G - Fact Sheets
- Appendix H - References
- Notice of Change to Board Workshop
- Public Notice (Extension)
- Public Notice
- Tentative Resolution
The Fact Sheets (Appendix G) include links to the reference documents used in the assessment. Navigate through the Table of Contents to view the water body-pollutant combination of interest.
Because of the large size of some of the appendices, the Water Board is not distributing paper copies of the entire staff report.
Changes may be made in staff recommendations as a result of written public comments and will be posted on the Water Board's Website and announced to the Water Board's electronic mailing list for the Section 303(d) List. Subscribe online to the "TMDLs-303(d) List" to receive these notifications by email. The Los Angeles Water Board will hold a Board workshop to discuss staff recommendations at the May 4 Board Meeting.
An agenda announcement with more details on the timing of the hearing will be posted on the Water Board's Website 10 days in advance of the May 4 Board Meeting.
Subscribe to Receive Email Notifications
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To receive information and notices on the Integrated Report, please subscribe using the following link:
- Los Angeles Regional Water Quality Control Board - 303(d) List of Impaired Water Bodies (under “Subscription Topics”, expand “Basin Planning” drop down menu)
Questions or Comments?
Environmental Scientist
LA Regional Water Quality Control Board
320 West 4th Street, Suite 200
Los Angeles, CA 90013
Telephone: (213) 576-6619
303(d) Lists Addressing the
Los Angeles Region
(Page last updated 2/8/25)
Water is a precious resource in California, and maintaining its quality is of utmost importance to safeguard the health of the public and the environment.
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