Surface Water Quality Assessment Program

California Integrated Report Map

The 2020-2022 California Integrated Report Map is a visualization tool developed to graphically display waterbodies assessed in the Integrated Report. This map is updated after each Integrated Report is approved by the U.S. EPA. Please click on the map for more information and to download shapefiles.

Welcome to the Surface Water Quality Assessment Program Webpage

The federal Clean Water Act (“CWA”) requires that California report on the quality of its surface waterbodies (such as rivers, streams, reservoirs, estuaries, lagoons, bays, and ocean waters) every two years. In order to meet this requirement, California develops the Integrated Report. The Integrated Report consists of the Clean Water Act section 303(d) list of impaired waters and 305(b) condition report. To develop the Integrated Report, data from California surface waters are evaluated and, if appropriate, assessed to determine if they contain pollutants at levels that exceed water quality standards. Development of the Integrated Report is a collaborative process between the State Water Resources Control Board and Regional Water Quality Control Boards and input from the public.

Placing a waterbody on the 303(d) list initiates the prioritization of Total Maximum Daily Load (“TMDL”) development, or another alternative restoration project, to restore and maintain water quality standards. The State Water Resources Control Board adopts the 303(d) list prior to submittal to the U.S. EPA for final approval.

The 305(b) condition report, commonly known as “305(b) report,” assigns an overall water quality condition to all assessed waterbody segments. The 305(b) condition report does not require U.S. EPA approval. However, the U.S. EPA will compile 305(b) reports from states and transmit the summaries in their “National Water Quality Inventory Report” to the United States Congress.

California’s Integrated Report is developed in "cycles" with submittal to the U.S. EPA every two years. Each listing cycle builds on assessments from the previous listing cycle; therefore, each time the Integrated Report is released, it contains all prior statewide assessments as well as any new or revised assessments based on the data received prior to the end of the data solicitation period.

Each Integrated Report cycle consists primarily of data assessments from waters within three Regional Water Quality Control Board regions that are identified in a Notice of Public Solicitation of Water Quality Data. The other six Regional Water Quality Control Boards may assess high-priority data, make listing or delisting recommendations, or propose changes to the 305(b) condition report as an “off-cycle” assessment. The State Water Resources Control Board and the Regional Water Quality Control Boards work in collaboration to develop the Integrated Report. For more information on data submittal for a Notice of Public Solicitation of Water Quality Data, please see Data and Information Submittal Basics.

For more information on the Integrated Report, please refer to the Fact Sheet. Frequently Asked Questions (FAQ) coming soon!

Current, In Progress, and Future Listing Cycles

The following table provides important information about each Integrated Report Cycle. The general timeframes provided are subject to change. For the most up to date information, please subscribe to the State Water Resources Control Boards Integrated Report 303(d)/305(b) email list. For more detailed information and official documentation for each cycle, please select the links for each cycle in the boxes below.

Subscribe to our Integrated Report 303(d)/305(b) Email List email list to receive notifications and the latest updates. After subscribing, you will need to check your email host for a confirmation email to complete the subscription.

  Subscribe to our other email lists. See the "Water Qualitysection.


For general questions about the Integrated Report, please contact us by email:

Assessment Tools & Support Unit Lead:
Lori Webber

Assessment Policy & Process Unit Lead:
Ana Maria Saenz

Assessment Data Specialist:
Jacob Kaplan

State Water Resources Control Board Ombdusperson:

Cycle Regions Milestone
2020-2022 (Current Integrated Report)

On-Cycle Regions:

  • Central Coast
  • Central Valley
  • San Diego

Off-Cycle Regions:

  • Colorado River Basin

State Water Board Approval: January 19, 2022

U.S. EPA Approval: May 11, 2022

2024 (In Progress)

On-Cycle Regions:

  • San Francisco Bay
  • Los Angeles
  • Santa Ana

Off-Cycle Regions:

  • Central Coast
  • Sacramento River watershed of the Central Valley Region
  • San Diego

Data Solicitation Period : June 29, 2020 – October 16, 2020

Public Review Comment Period: February 16-April 3, 2023

State Board Consideration: February 6, 2024

Submittal to U.S. EPA: Spring 2024

2026 (In Progress)

On-Cycle Regions:

  • North Coast
  • Lahontan
  • Colorado River Basin

Off-Cycle Regions:

  • San Joaquin River watershed of the Central Valley Region

Data Solicitation Period : April 18, 2022 – October 21, 2022

Data Evaluation and Assessment: Winter 2022-Winter 2024

Public Review and Comment Period: Spring 2025

State Board Consideration: Winter 2025/2026

Submittal to U.S. EPA: Spring 2026