Is Collecting Rainwater Legal in California? (2026)
Yes — Collecting Rainwater is legal in California as of 2026.
Law changed in 2012: While the Rainwater Capture Act of 2012 remains the foundational law, Governor Newsom issued an executive order in January 2025 to maximize storm water capture, indicating a continued and urgent focus on water conservation.
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Quick Answer
California encourages rainwater harvesting and has no restrictions on residential rainwater collection under California Water Code § 10540-10546. The state promotes rainwater capture as a water conservation method.
What the Law Says
The Rainwater Capture Act of 2012 made it legal to collect rainwater as long as you comply with State Water Resources Board regulations.
— California Department of Water Resources
| Category | Details |
|---|---|
| Collection Rules | No restrictions on possession or use of rainwater collection systems. |
| Volume Limits & Permits | No specific laws regulating sale or purchase of rainwater. |
| Violation Penalties | N/A |
| Pending Legislation | None known |
While the Rainwater Capture Act of 2012 remains the foundational law, Governor Newsom issued an executive order in January 2025 to maximize storm water capture, indicating a continued and urgent focus on water conservation.
Enforcement Reality
Rainwater harvesting from rooftops is legal and does not require a state water right permit. Local jurisdictions, like the City of Oakland, may have their own permit requirements for system installation, so enforcement is primarily handled at the municipal level.
A common mistake is failing to check with local city or county governments for specific permit requirements before installing a system. Another is not implementing proper filtration, leading to contaminants from roofing materials entering the stored water.
Local Exceptions
None identified. State law applies uniformly across California. Local ordinances may still vary — check with your city or county government for any additional rules.
Bottom Line
Collecting Rainwater is legal in California. You can collecting rainwater without violating state law, though federal rules and local ordinances may still apply. Always verify current law before acting.
California vs. the Rest of the US
Across the US, collecting rainwater is fully legal in 30 states, restricted in 20, and illegal in 0. California falls in the LEGAL category.
View the full 50-state map →Neighboring States
Laws change at state lines. Here is how bordering states compare on Collecting Rainwater:
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Frequently Asked Questions
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Reviewed by cross-referencing the cited state statute against current legislative databases and regulatory publications.
Sources & Verification
This page was reviewed by Ethan Harper by comparing the legal status against the cited state statute. AllowedHere is an informational resource and does not provide legal advice. Consult a licensed attorney for guidance specific to your situation.
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