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AB 638

Stormwater: uses: irrigation.

2025-2026 Regular Session Introduced by Ben Allen and 3 co-sponsors

AB 638 permits California to use captured stormwater for irrigation, reducing freshwater demand during drought while managing urban runoff through alternative water sources.

In committee: Held under submission.
#stormwater #irrigation #uses
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WeVote Research Nonpartisan
Bill Summary · AB 638

Legislative bill overview

AB 638 authorizes California to use captured stormwater for irrigation purposes, expanding the permitted non-potable uses of stormwater runoff. The bill appears designed to reduce freshwater demand by redirecting stormwater—currently managed as waste in many areas—toward landscape and agricultural irrigation applications.

Why is this important

California faces chronic water scarcity and drought conditions, making alternative water sources critical for sustainability. Stormwater irrigation could reduce reliance on groundwater and surface water supplies while managing urban runoff, though implementation requires infrastructure investment and regulatory clarity on water quality standards.

Potential points of contention

  • Water quality standards: Stormwater contains pollutants (oils, metals, sediment) that may require treatment before irrigation use, raising costs and technical questions about safety thresholds
  • Local implementation burden: Cities and counties would bear costs and responsibility for stormwater capture systems without clear state funding mechanisms
  • Agricultural water competition: Expanded irrigation uses could shift water availability between urban landscaping and farming sectors, creating allocation disputes

Compiled from official sources — confirm details with the bill’s official record.

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