Is Collecting Rainwater Legal in Arizona? (2026)
Partially — Collecting Rainwater is legal with restrictions in Arizona as of 2026.
Law changed in 2022: House Bill 2830, passed in 2022, allows municipalities to establish a fund for rainwater harvesting systems. No other major statewide legislative changes have occurred since.
Quick Answer
Arizona regulates rainwater harvesting under ARS § 45-1121, allowing limited collection of rainwater for certain uses but restricting large-scale capture due to prior appropriation water rights. Residential rainwater harvesting is permitted with specific system requirements.
What the Law Says
Allows limited collection of rainwater for certain uses but restricting large-scale capture due to prior appropriation water rights. Residential rainwater harvesting is permitted with specific system requirements.
— Arizona Department of Water Resources
| Category | Details |
|---|---|
| Collection Rules | Allowed for residential use with system registration; large-scale collection restricted. |
| Volume Limits & Permits | Sale of collected rainwater is generally prohibited without a water rights permit. |
| Violation Penalties | Violations can result in civil penalties and fines under ARS § 45-1121. |
| Pending Legislation | None known |
House Bill 2830, passed in 2022, allows municipalities to establish a fund for rainwater harvesting systems. No other major statewide legislative changes have occurred since.
Enforcement Reality
Rainwater harvesting is legal and encouraged, with some municipalities like Tucson and Flagstaff having local ordinances that mandate or incentivize rainwater collection for new commercial and residential developments. Enforcement is primarily at the local level, focusing on compliance with these building codes.
A common mistake is failing to comply with local ordinances for new construction, which may specify system size and usage. Another is using collected rainwater for potable purposes without adequate filtration and treatment, posing health risks.
Local Exceptions
None identified. State law applies uniformly across Arizona. Local ordinances may still vary — check with your city or county government for any additional rules.
Bottom Line
Collecting Rainwater is legal with restrictions in Arizona. This activity is permitted, but specific conditions apply. Violating those conditions can result in fines or criminal charges. Read the rules carefully and consult an attorney if unsure.
Arizona vs. the Rest of the US
Across the US, collecting rainwater is fully legal in 29 states, restricted in 21, and illegal in 0. Arizona falls in the RESTRICTED category.
View the full 50-state map →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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