AB 2521CALIFORNIASession 20252026

California mandates Central Valley watershed water availability study by 2028

Original title: California Council on Science and Technology: water availability study: Central Valley.

August 13, 2026

Water Management Central Valley Science and Technology Environmental Policy Water Rights CaliforniaCouncilonScienceandTechnology CentralValley wateravailabilitystudy

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The Frame

What this does

This study will establish the scientific baseline for future water storage and permits in the Central Valley, directly impacting how water rights and projects are evaluated for farmers, municipalities, and environmental stakeholders.

Who is mentioned in the record

Potentially affected actors named in the source documents. Mention is not a position.

Central Valley water users

Future water diversion and storage permit applications in the selected watersheds will be evaluated based on the findings of this study.

California Council on Science and Technology

The organization is requested to undertake and complete a comprehensive water availability study.

What changed

Last recorded activity August 13, 2026.

What's next

Introduced.

Summary

AB 2521 requires the Department of Water Resources to select two Central Valley watersheds by January 1, 2028, to undergo a comprehensive . This study, to be conducted by the California Council on Science and Technology (CCST) pending legislative funding, will analyze 30 years of daily flow rates to inform future water permit applications.

Key Facts

You don't have to trust us. Each fact below is taken straight from the official document - click any one to see the exact passage, highlighted in the original.

Why It Matters

Frequently Asked Questions

What is the purpose of this study?

The study aims to provide a comprehensive analysis of water availability in specific Central Valley watersheds to help evaluate future applications for water and .

Who is responsible for conducting the study?

The California Council on Science and Technology (CCST) is requested to conduct the study, provided the Legislature appropriates the necessary funding.

News Coverage

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Discoveries

Patterns POLISCOPE noticed across the record. These are observations to investigate, not conclusions.

policy shift90% confidence

Standardization of Water Analysis

The bill explicitly links scientific study outcomes to the regulatory process for future water diversion permits, signaling a move toward data-driven permitting in the Central Valley.

Department of Water Resources State Water Resources Control Board

Connected Entities

organizationCalifornia Council on Science and Technology“Requested to conduct the comprehensive water availability study.”Map →

organizationDepartment of Fish and Wildlife“Consults on the selection of watersheds.”Map →

organizationDepartment of Water Resources“Responsible for selecting watersheds and consulting on the study.”Map →

organizationState Water Resources Control Board“Consults on the study and manages water rights permits.”Map →

Sources

Open source document

openstates.org

Analysis Score

0–100

Significance65
How much this matters to a regular citizen
Controversy20
Intensity of disagreement among stakeholders
Entertainment5
Compellingness for a non-policy-wonk reader
Buzz15
Current news / social attention level

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