The Integrated Report - 303(d) List of Water Quality Limited Segments
and 305(b) Surface Water Quality Assessment

California has integrated the 303(d) List of Impaired Waters and the 305(b) Water Quality Assessment Report into a single report (Integrated Report). This Integrated Report satisfies the requirements of both CWA Sections 303(d) and 305(b).

Section 303(d) of the federal Clean Water Act and 40 CFR §130.7 require states to identify water bodies that do not meet water quality standards and are not supporting their beneficial uses. These waters are placed on the Section 303(d) List of Water Quality Limited Segments (also known as the list of Impaired water bodies). The List identifies the pollutant or stressor causing impairment and establishes a schedule for developing a control plan to address the impairment. Placement on this list generally triggers development of a pollution control plan called a Total Maximum Daily Load (TMDL) for each water body and associated pollutant/stressor on the list. The TMDL serves as the means to attain and maintain water quality standards for the impaired water body.

Section 305(b) of the federal Clean Water Act requires states to report biennially to the USEPA on the water quality conditions of their surface waters. The USEPA then compiles these assessments into their biennial “National Water Quality Inventory Report” to Congress.

If you would like to receive announcements and notices pertaining to the Integrated Report by e-mail, please visit our e-mail subscriptions page.

2018 Integrated Report - 303(d) List & 305(b) Report

Each Regional Water Board assesses surface water quality data every six years. For the 2018 Integrated Report, North Coast Regional Board staff comprehensively assessed surface water quality data, including new data received since the development of the 2012 Integrated Report. The assessment resulted in the 303(d) List of impaired waterbodies and 305(b) Report categorizations of the condition of waterbodies. Following public review, comments, and a hearing workshop, the State Water Board adopted the North Coast Regional Board’s 303(d) List and approved the combined statewide 303(d) List. The State Board submitted the 2018 Integrated Report 303(d) List to U.S. EPA for review. Proposed changes to the North Coast Regional Board’s 2014/2016 303(d) List and to the 2018 303(d) List submitted to U.S. EPA are identified in the final staff report.

The public review and comment process was conducted by the State Board and more information for the 2018 Integrated Report is available on the State Water Resources Control Board’s Surface Water Quality Assessment website.

Integrated Report Timeline

2014 & 2016 Integrated Report - 303(d) List & 305(b) Report

The State Water Board has combined the 303(d) List and the 305(b) Report into the 2014 and 2016 California Integrated Report. Only the 303(d) List portion of the 2014 and 2016 California Integrated Report requires approval by the State Water Board and U.S. EPA.

There were no new data or information assessed for the North Coast Regional Water Quality Control Board in the 2014 & 2016 Integrated Report.  Therefore, there were no changes to the 2012 303(d) List for the North Coast Region.

The 303(d) List is a compilation of the 303(d) lists approved by the Regional Water Quality Control Boards (Regional Water Boards) for the San Francisco (Region 2), Central Coast (Region 3), Central Valley (Region 5), Santa Ana (Region 8), and San Diego (Region 9) regions. The 303(d) List also includes State Water Board additions, deletions, and changes to the 303(d) lists approved by those regions. The State Water Board approved the 303(d) list for the Los Angeles region (Region 4) and incorporated it into the California 303(d) List consistent with Section 6.2 of the Water Quality Control Policy for Developing California’s Clean Water Act Section 303(d) List (Listing Policy).

After approval of the 303(d) List portion of the California Integrated Report by the State Water Board, the complete 2014 and 2016 California Integrated Report was submitted to U.S. EPA for final approval of the California 303(d) List.

To view the 2014 & 2016 Integrated Report webpage: hhttps://www.waterboards.ca.gov/water_issues/programs/tmdl/integrated2014_2016.html

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.

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Contact Information

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