Integrated Report Cycles – Clean Water Act Sections 303(d) and 305(b)

California’s Clean Water Act section 303(d) and 305(b) Integrated Report is developed in "cycles" with each cycle occurring every two years. Each Integrated Report cycle consists primarily of assessments from the three Regional Water Quality Control Boards that are identified "on-cycle" by the notice of solicitation. The other six Regional Water Quality Control Boards that are "off-cycle" may also assess new high-priority data and make new listing or delisting decisions for one or more water segments. The current and upcoming Integrated Report cycles are as follows:

Integrated Report Cycle

On-Cycle Regional Water Quality Control Boards

2020-2022

Central Coast, Central Valley, San Diego

2024

San Francisco Bay, Los Angeles, Santa Ana; plus the Sacramento River watershed of the Central Valley Region as an off-cycle assessment

2026

North Coast, Lahontan, Colorado River Basin; plus the San Joaquin River watershed of the Central Valley Region as an off-cycle assessment

Below is an overview of the process and approximate schedule used in developing the Integrated Report. The chart is not reflective of any particular "cycle" but generally depicts the amount of time that corresponds to each of the steps necessary to complete a single cycle. In total, a cycle takes three to four years to complete.

Steps Approx. Months
1. Data Solicitation 6
2. Data Organization, Quality Review & Mapping
3. Data Analysis 13
4. Regional Board Public Process* 10
5. State Board Public Process* 10
6. USEPA Review & Approval 1

* Steps 4 and 5 may be combined into one Regional and State Board Public Process.

In Progress: 2026, 2024, 2020-2022 | Current: 2018 | Previous


2026 Integrated Report - In Progress

The 2026 Integrated Report is currently in progress. The 2026 California Integrated Report listing cycle will be conducted for the “on-cycle” Regional Water Quality Control Boards (“Regional Water Boards”) for the North Coast, Lahontan, and Colorado River Basin regions. The Central Valley Regional Water Board will be conducting “off-cycle” assessments for waters within the San Joaquin sub-area. The San Joaquin River sub-area is defined as the San Joaquin River watershed, which includes the mainstem of the San Joaquin River upstream of the legal boundary of the Sacramento-San Joaquin Delta and all surface waters tributary to the mainstem. The other five Regional Water Boards would be considered “off cycle” for the 2026 Integrated Report but the listing process may be administered for one or more waters at the Regional Water Board’s or the State Water Board’s discretion.

2024 Integrated Report - In Progress

The 2024 Integrated Report is currently in progress. The 2024 California Integrated Report listing cycle will be conducted for the “on-cycle” Regional Water Quality Control Boards (“Regional Water Boards”) for the San Francisco, Los Angeles, and Santa Ana regions. The Central Valley Regional Water Board will be conducting “off-cycle” assessments for waters within the Sacramento River sub-area. The Sacramento River sub-area is defined as the Sacramento River watershed. It includes the mainstem of the Sacramento River above the legal boundary of the Sacramento-San Joaquin Delta and all surface waters tributary to the mainstem. The other five Regional Water Boards would be considered “off cycle” for the 2024 Integrated Report but the listing process may be administered for one or more waters at the Regional Water Board’s or the State Water Board’s discretion.

Water Board staff are currently assessing data submitted during the data solicitation period for the 2024 Integrated Report.  The Draft Staff Report for the 2024 California Integrated Report is expected to be released to the public in early 2023.

2020-2022 Integrated Report - Current Integrated Report

As updated here, the California Integrated Reports for the 2020 and 2022 is developed in one listing cycle. The 2020 Integrated Report shall now be referred to as the 2020-2022 Integrated Report but is developed in accordance with the 2020 Revised Notice of Solicitation. For the 2020-2022 Integrated Report, the Central Coast, Central Valley, and San Diego Regional Water Boards are “on cycle.” In addition, the Colorado River Basin Regional Water Board conducted an “off-cycle” assessment for one or more waterbodies within their region. For the 2020-2022 Integrated Report, the State Board administered the public process. The 2020-2022 Integrated Report was adopted by the State Water Board on January 19, 2022 and submitted to the U.S EPA on April 1, 2022.

Previous Reports

2018 Integrated Report

The 2018 Integrated Report has been approved by U.S. EPA.

2014/2016 Integrated Report

2014/2016 Integrated Report (CWA Section 303(d) List / 305(b) Report)

2012 Integrated Report

2012 Integrated Report (CWA Section 303(d) List / 305(b) Report)
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.

2010 Integrated Report

2010 Integrated Report (CWA Section 303(d) List / 305(b) Report)
On October 11, 2011, the U.S.EPA issued its final decision regarding the water bodies and pollutants added to California's 303(d) List. This replaces the 2006 California Clean Water Act 303(d) List as California's current 303(d) List.

Previous 303(d) Lists and 305(b) Reports
The 2010 Integrated Report is the first Integrated Report developed for the State of California. Previous assessments were developed by the State Water Board in separate documents and can be found at the following links:

Previous Clean Water Act Section 303(d) Lists


Previous Clean Water Act Section 305(b) Reports


Earlier 305(b) Reports are not available in digital format. These reports can be requested through the Public Records Center