| Document Updated | Brief Description of Changes | Approved by WQCC | Approved by EPA |
| WQMP and CPP | Incorporate changes and new developments that have occurred since the last revision in 2011 Update the antidegradation policy implementation procedure (Appendix A) Incorporate the Wetland Program (Previously Section XV) into regulatory mandated portions of the WQMP/CPP primarily under the Nonpoint Source Management and Control (Section VII) Update program descriptions and citations to referenced documents | 09.21.2020 | 10.23.2020 |
| WQMP and CPP | Consolidated WQMP and CPP Initially adopted the following new elements: Developed Wetlands Program Adopted Underground Injection Control (UIC) regulations Created Water Cabinet for Water and Wastewater Infrastructure Added Hydrology Protocol for determining water body type (ephemeral, intermittent, perennial) Updated and revised: References and citations Program descriptions WQS amendments Completion of the TMDL settlement agreement requirements Process for establishing TMDLs Nonpoint Source Management Program | 05.10.2011 | 12.23.2011 |
| WQMP | Updated the Antidegradation Policy Implementation Procedure (Appendix A) | 2010 | 04.11.2013 |
| CPP | Initially adopted Antidegradation Policy Implementation Procedure | December 2004 | |
| WQMP | Updated Introduction to provide background on how water quality is managed and Work Element 11 (Public Participation Program) (now Section XIV) to include outreach protocols and strategies | May 2003 | |
| WQMP | Restructured for comprehensiveness, accessibility, and usability Reorganized to track current federal requirements Removed outdated or non-applicable elements Consolidated partial updates | 12.17.2002 | |
| CPP | July 1998 | ||
| WQMP | Updated Work Element 6 (Point Source Load Allocations) | September 1989 | |
| WQMP | Updated Work Element 13 (Designation of Management Agencies) | September 1988 | |
| WQMP | Updated Work Element 3 (Population Projections) | April 1986 | |
| WQMP | Updated Work Elements 6 (Point Source Load Allocations) and 13 (Designation of Management Agencies) | October 1985 | |
| WQMP | Initially adopted Work Element 14 (Implementation Schedules)Updated Work Elements 4.1 (Irrigated Agriculture), 4.2 (Silviculture), 4.3 (Sediment Study), 13 (Designation of Management Agencies) | August 1984 | |
| WQMP | Updated Work Element 4.1 (Irrigated Agriculture) | September 1983 | |
| WQMP | Updated Work Element 6 (Point Source Load Allocations) | May 1982 | |
| WQMP | Initially adopted Work Element 13 (Designation of Management Agencies)Updated Work Element 3 (Population Projections) | October 1980 | |
| WQMP | Updated Work Element 3 (Population Projections) | October 1979 | |
| WQMP | Initially adopted Work Elements 2.5 (Trout Hatcheries), 4.3 (Sediment Study) 8.0 (Industrial Waste Treatment System Needs: Toxic Substance Study) and 9.5 (Development of Statewide Groundwater Monitoring System) | May 1979 | |
| WQMP | Initially adopted | 1978 | |
| CPP | Initially adopted | 1976 |
