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.

Step Approximate Months
1. Data solicitation 6
2. Data organization, quality review, and mapping 9
3. Data analysis 13
4. Regional Board public process 10
5. State Board public process 10
6. USEPA review and approval 1

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.


Activity

Date

Notice of data solicitation April 18, 2022

Close of data solicitation

October 21, 2022

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.


Activity

Date

Notice of data solicitation

June 29, 2020

Close of data solicitation

October 16, 2020

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


Activity

Date

Notice of data solicitation

December 14, 2018

Close of data solicitation

June 14, 2019

Start of State Board written comment period for draft report

June 4, 2021

State Board Public Hearing

July 6, 2021

Close of State Board written comment period for draft report

July 16, 2021

State Water Board Adoption Hearing

January 19, 2022

State Board Submittal of Integrated Report to U.S. EPA April 1, 2022

U.S. EPA approval of 303(d) report

May 11, 2022

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.


Activity

Date

Notice of data solicitation

November 3, 2016

Close of data solicitation

May 3, 2017

Start of State Board written comment period for draft report

March 19, 2020

North Coast Regional Board Information Item

April 16, 2020

State Board Public Hearing (workshop)

April 21, 2020

Close of State Board written comment period for draft report

April 30, 2020

State Water Board Adoption Hearing

October 20, 2020

State Board Submittal of Integrated Report to U.S. EPA

February 12, 2021

U.S. EPA approval of 303(d) report

June 9, 2021

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

 

Activity

Date

Notice of data solicitation

January 14, 2010

Close of data solicitation

August 30, 2010

Start of State Board written comment period for draft report

June 9, 2017

Close of State Board written comment period for draft report

July 10, 2017

State Board Public Hearing

October 3, 2017

State Water Board Adoption Hearing

October 2, 2017

State Board submittal of Integrated Report to U.S. EPA

February 15, 2018

U.S. EPA approval of 303(d) report

April 6, 2018

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


Activity

Date

Notice of data solicitation

January 14, 2010

Close of data solicitation

August 30, 2010

Start of Regional Board 303(d) list written comment period

July 30, 2014

Regional Board 303(d) list workshop

May 8-9, 2014

Close of Regional Board 303(d) list written comment period

April 18, 2014

Start of State Board draft 303(d) list written comment period

December 31, 2014

State Board 303(d) list public hearing

March 17, 2015

Close of State Board 303(d) list written comment period

February 5, 2015

State Water Board Adoption Hearing

April 8, 2015

State Board submittal of 303(d) list to U.S. EPA

April 24, 2015

U.S. EPA approvals of 303(d) report

June 26, 2015 &
July 30, 2015

U.S. EPA submittal of 305(b) report to Congress

August 2017

 

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.

Contact Information

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

  (Page last updated 8/15/22)

 
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