305(b)/303(d) Integrated Report

Announcements

The 2018 303(d) List of Impaired waters is the current 303(d) List and was approved by the U.S. EPA on June 9, 2021. For additional information please see the “2018 Integrated Report” heading below.

Submit data to be considered for the 2026 Integrated Report to the California Environmental Data Exchange Network (CEDEN) by 12:00 pm noon on October 21, 2022. Please see the data solicitation notice for more information.

About the 305(b)/303(d) Integrated Report

The 305(b)/303(d) Integrated Report documents a comprehensive review of surface water quality. Where available, data are examined for each waterbody to determine if the amount of a pollutant in a waterbody supports or impairs a broad range of uses of water. The 305(b) report assigns a USEPA approved Condition Category to all examined waterbody segments, dependent on the the conclusions of this assessment. Waterbodies where a pollutant load impairs a beneficial use (Condition Categories 4 & 5) are placed on the 303(d) list of Impaired Waters. Placing a waterbody on the 303(d) List generally triggers the development of a Total Maximum Daily Load (TMDL). In some cases, other regulatory programs will address the impairment instead of a TMDL.

Regional Water Quality Control Boards go through this comprehensive review for surface waters within their Region, which the State Water Resources Control Board (State Water Board) combine into a single statewide report. The statewide report is produced every two years for a portion of the Regional Water Boards (those that are “on cycle”). Generally, each Regional Water Board produces an Integrated Report every six years. The next comprehensive report for the North Coast Regional Water Quality Control Board is expected to be completed in 2026.

The 305(b) report is submitted by the U.S. EPA to the U.S. Congress. The 303(d) List is approved by the State Water Board before being submitted to the U.S. EPA for approval.
Each Integrated Report is generally developed over four years.

To receive email updates from the North Coast Regional Water Quality Control Board about the Integrated Report, please subscribe to our Integrated Report – 303(d) List and 305(b) Report email list.

To receive email updates from the State Water Resources Control Board about the Integrated Report, under their Water Quality tab, please subscribe to their Integrated Report – 303(d)/305(b) email list.

2026 Integrated Report

The North Coast Regional Water Quality Control Board will assess new data for the 2026 Integrated Report.

2024 Integrated Report

No new data will be assessed by the North Coast Regional Water Quality Control Board for the 2024 Integrated Report. Therefore, there will be no revisions to the North Coast Regional Water Board’s current 305(b) report or 303(d) list.

The 2024 Integrated Report is a compilation of assessments by the San Francisco Bay (Region 2), Los Angeles (Region 4), Central Coast (Region 5), and Santa Ana (Region 8) Regional Water Quality Control Boards.

2020-2022 Integrated Report

No new data were assessed by the North Coast Regional Water Quality Control Board for the 2020-2022 Integrated Report. Therefore, there were no revisions to the North Coast Regional Water Board’s 305(b) report or 303(d) list.

The 2020-2022 Integrated Report is a compilation of comprehensive assessments by the Central Coast (Region 3), Central Valley (Region 5), and San Diego (Region 9), and a partial assessment by the Colorado River Basin (Region 7) Regional Water Quality Control Boards.

2020-2022 Integrated Report webpage

2018 Integrated Report – The Current USEPA Approved 303(d) List

The North Coast Regional Water Quality Control Board assessed new data for the 2018 Integrated Report.

The 2018 Integrated Report is a compilation of comprehensive assessments by the North Coast (Region 1), Lahontan (Region 6), and Colorado River Basin (Region 7) and partial assessments by the San Francisco (Region 2), Central Valley (Region 5), and Los Angeles (Region 4) Regional Water Quality Control Boards.

2018 Integrated Report webpage

The 2018 303(d) List for the North Coast Region is the current 303(d) list for the North Coast Regional Water Quality Control Board.

2018 303(d) List for the North Coast Region

2014-2016 Integrated Report

No new data were assessed by the North Coast Regional Water Quality Control Board for the 2014-2016 Integrated Report. Therefore, there were no revisions to the North Coast Regional Water Board’s 305(b) report or 303(d) list.
The 2014-2016 Integrated Report is a compilation of comprehensive assessments by the San Francisco (Region 2), Central Coast (Region 3), Los Angeles (Region 4), Central Valley (Region 5), Santa Ana (Region 8), and San Diego (Region 9) Regional Water Quality Control Boards.

2014-2016 Integrated Report webpage

2012 Integrated Report

The North Coast Regional Water Quality Control Board assessed new data for the 2012 Integrated Report.
The 2012 Integrated Report is a compilation of comprehensive assessments by the North Coast (Region 1), Lahontan (Region 6), and Colorado River Basin (Region 7) Regional Water Quality Control Boards.

2012 Integrated Report webpage

Join the Integrated Report – 303(d) List & 305 (b) Report e-mail Notification List

If you would like to receive notices pertaining to Integrated Report – 303(d) List & 305(b) Report by e-mail please visit our e-mail subscriptions page, fill in your name and e-mail address, and check the box titled “Integrated Report - 303(d) List and 305(b) Report”. This will ensure that you receive an e-mail copy of all future notices put out by the North Coast Regional Water Quality Control Board relating to the Integrated Report.

• Email List Subscription Webpage

Contact Information

Mary Bartholomew
Adaptive Management Unit
707-576-2662
Mary.Bartholomew@waterboards.ca.gov