2026 California Integrated Report
For the 2026 California Integrated Report, data from waterbodies in the North Coast, Lahontan, and Colorado River Basin Regional Quality Water Boards will be assessed as “on-cycle’ assessments. Data from waterbodies within the San Joaquin River sub-area in the Central Valley Regional Water Board will be assessed as “off-cycle” assessments. San Joaquin River sub-area is defined as the San Joaquin River watershed and includes the mainstem of the San Joaquin River upstream the legal boundary of the Sacramento-San Joaquin Delta and all surface waters tributary to the mainstem. Additionally, data and information from several waterbodies within the Central Coast and San Diego Regional Water Boards are considered as “off cycle” assessments.
New! Tips for submitting comments on the draft 303(d) List for the 2026 California Integrated Report and supporting draft staff report. Optional guidance documents are now available to provide tips on submitting comments and templates for supporting data and information on the draft 2026 California Integrated Report. These documents are optional and are not required to submit comments:
- Tips for Submitting Comments
- Template Comment Letter Appendix - Supporting Data and Information (Excel Version)
- Template Comment Letter Appendix - Supporting Data and Information (Word)
Project Timeline
| January 30, 2025 | January 30 – April 2, 2025 | February 11, 2025 | March 18, 2025 | Winter 2025 | Winter 2025 | Spring 2026 |
|---|---|---|---|---|---|---|
| Release of Draft 2026 Integrated Report and Staff Report | Public Review and Comment Period | Staff Hosted Virtual Public Workshop | Hearing on the proposed statewide 303(d) List | Release of Response to Comments and Revised 2026 Integrated Report and Staff Report | State Board Consideration of Adoption | Submittal to U.S. EPA |
Notices and Draft Staff Report
- Recording of February 11, 2025, Staff Hosted Virtual Public Workshop
- Notice of Staff Hosted Public Workshop, Public Hearing and Opportunity for Public Comment for the Draft 2026 California Clean Water Act Section 303(d) List
- Draft Staff Report for the 2026 California Integrated Report: Surface Water Quality Assessments to comply with Clean Water Act 303(d) List and 305(b) Report
- Appendix A: 2026 303(d) List of Impaired Waters
- Appendix B: Statewide Waterbody Fact Sheets
- Appendix C: State Water Board’s Integrated Report Condition Category Reports
- Appendix C1: Category 1 Waterbody Segments
- Appendix C2: Category 2 Waterbody Segments
- Appendix C3: Category 3 Waterbody Segments
- Appendix C4a: Category 4a Waterbody Segments
- Appendix C4b: Category 4b Waterbody Segments
- Appendix C4c: Category 4c Waterbody Segments
- Appendix C5: Category 5 Waterbody Segments
- Appendix D: Map and Visualization Tool for the 2026 California Integrated Report
- Appendix E: TMDLs Adopted by Regional Water Boards since January 2009
- Appendix F: Generalized Flow Chart for Fish Tissue Mercury Assessments for the California Integrated Report
- Appendix G: Miscellaneous Mapping Changes Report
- Appendix H: Reference Reports
- Appendix H1: Region 1 Reference Report
- Appendix H2: Region 2 Reference Report
- Appendix H3: Region 3 Reference Report
- Appendix H4: Region 4 Reference Report
- Appendix H5: Region 5 Reference Report
- Appendix H6: Region 6 Reference Report
- Appendix H7: Region 7 Reference Report
- Appendix H8: Region 8 Reference Report
- Appendix H9: Region 9 Reference Report
- Appendix H10: Statewide Reference Report
- Appendix I: 2026 303(d) List of New Waterbody-pollutant Combination Listing and Delistings
- Appendix J: List of Retired Lines of Evidence
- Appendix K: List of Summing Pollutants
- Appendix L: California's Prioritization Framework for Plans to Restore Impaired Waterbodies
- Appendix M: List of Constructed Waters in the Central Valley Region
- Appendix N: 2026 California Integrated Report Data Evaluated
- Appendix O: 2026 California Integrated Report Water Quality Objectives, Criteria, and Evaluation Guidelines
- 2026 Data Solicitation Notice
