TMDL - The Integrated Report

• New! 2026 Integrated Report - Data Solicitation Notice available
• New! 2024 Integrated Report - IN PROGRESS
• New! 2020-2022 Integrated Report - Pending U.S. EPA approval
• New! 2018 Integrated Report Approved by U.S. EPA - June 9, 2021

• 2026 Integrated Report - Data Solicitation Notice available
• 2024 Integrated Report - IN PROGRESS
• 2020-2022 Integrated Report - Pending U.S. EPA approval
• 2018 Integrated Report - The CURRENT 303(d) List
• The 2012 Integrated Report
• The 2008-2010 Integrated Report
• Previous Lists of Water Quality Limited Segments and Previous 303(d) List Updates
• The Water Quality Control Policy for Developing California’s Clean Water Act Section 303(d) List (Listing Policy)

• 2026 Data Solicitation Notice

The Central Valley Water Board will assess all readily available data for waters in the Sacramento River watershed. Readily available data for the San Joaquin River watershed, the Sacramento - San Joaquin River Delta, and the Tulare Lake Basin will be considered during future Integrated Report cycles. More information on the 2024 Integrated Report for California can be found at:

• State Water Board's Integrated Report Cycles web page

The Central Valley Water Board assessed all readily available data for waters in the Central Valley Region.The 2020-2022 Integrated Report was adopted by the State Water Board on January 19, 2022 and is pending approval by U.S. EPA.

• State Water Board's 2020-2022 California Integrated Report web page

The Central Valley Region did not complete a full assessment of all readily available surface water quality data until the 2020 Integrated Report cycle. As part of the 2018 Integrated Report Cycle the Central Valley Water Board evaluated changes to the 303(d) listing status for impaired waters being addressed by a TMDL or another regulatory program. On June 9, 2021 the U.S. Environmental Protection Agency (USEPA) adopted changes to the 2018 303(d) List of impaired bodies.

• USEPA's final approval letter and enclosure for California's 2018 303(d) List
• State Water Board Resolution adopting changes to the 2018 303(d) List
• Central Valley Water Board Resolution adopting changes to the 2018 303(d) List
• California 2018 303(d) combined list table (combines category 4a, 4b, and 5):
  • 303(d) List - Excel file (includes potential sources) - the default value for potential sources is source unknown unless a source analysis has been performed or some other supporting information
• More information on the 2018 Integrated Report for the Central Valley Region
• More information on the 2018 Integrated Report for California

On April 6, 2018, USEPA approved California's 2014-2016 List of Impaired Waters. This replaces the 2012 California Clean Water Act section 303(d) List as California's current 303(d) List.

• USEPA's final approval letter and enclosure for California's 2014-2016 303(d) List
• State Water Board Resolution adopting changes to the 303(d) List
• Central Valley Water Board Resolution adopting changes to the 303(d) List
• California 2014 and 2016 303(d) combined list table (combines category 4a, 4b, and 5):
  • 303(d) list - Excel file (includes potential sources) - the default value for potential sources is source unknown unless a source analysis has been performed or some other supporting information
• More information on the 2014 Integrated Report for the Central Valley Region
• More information on the 2014-2016 Integrated Report for California

The 2012 303(d) List contains updates for three Regional Water Boards (North Coast, Lahontan, and Colorado River Basin) as well as the carryover decisions from the previously approved 2008/2010 303(d) Lists for the other six Regional Water Boards (including the Central Valley).

On July 30, 2015, the U.S. EPA issued its final decision regarding the waterbodies and pollutants added to California's 303(d) List. This replaces the 2010 California Clean Water Act section 303(d) List as California's current 303(d) List.

• More information on the 2012 Integrated Report can be found on the State Water Board's website

Statewide 2008 - 2010 303(d) List

On 12 November 2010, USEPA approved California’s 2008-2010 Section 303(d) List of Impaired Waters and disapproved the omission of several water bodies and associated pollutants that meet federal listing requirements.  On October 11, 2011, USEPA issued its final decision regarding the waters USEPA added to the State’s 303(d) list.  USEPA provided public notice and solicited public comment on its identification of additional water bodies and associated pollutants for inclusion on California's List.  The final list of water bodies that EPA is adding to California's list of water quality limited segments still requiring a TMDL includes all the water bodies and associated pollutants identified in USEPA's November 12, 2010 letter, with the exception of San Joaquin River (Mendota Pool to Bear Creek) for electrical conductivity.

• USEPA's final approval letter and enclosure for California's 2010 303(d) List
  
• The Statewide 2008 - 2010 303(d) List, including those listings added by the USEPA for the Central Valley Region, is available here:
  • USEPA Approved 2008-2010 303(d) List
    
• 2008 - 2010 Clean Water Act Section 303(d)/305(b) Integrated Report for the Central Valley Region
  • Final Staff Report
  • USEPA Approved 2008-2010 303(d) List - Central Valley Region
    
• More information on the 2008 - 2010 303(d) list and the 303(d)/305(b) Integrated Report for the Central Valley Region
  
• More information about the Statewide 2008 - 2010 Integrated Report is available on the State Water Board’s website at the link below. 
  • Statewide 2010 Integrated Report for the Clean Water Act Section 303(d) List & 305(b) Report

• Information for the (2006) 303(d) List

  • The 2006 California 303(d) List of Water Quality Limited Segments
    • Impaired waterbodies in Region 5 that still need TMDLs
    • Impaired waterbodies being addressed by USEPA Approved TMDLs (Region 5 starts on page 40)
    • NEW - Microsoft Excel Version of the 2006 303(d) list for Region 5
      This file includes both listings requiring TMDLs and listings already being addressed by USEPA approved TMDLs. The file does not include potential source categories, which can be found in the PDF versions of the 2008 303(d) list at the links above.

• Information on the 2002 303(d) List

  • The 2002 303(d) list
    • Central Valley Water Board Final Staff Report on Recommended Changes to the 303(d) List (December 2001)
      • Main Report
      • Appendix A - Numeric Criteria Fact Sheets
      • Appendix B - Fact Sheets for Recommended Changes