Rainwater collection is legal in Sunnyvale under California AB 1750. Rain barrels under 50 gallons are exempt from permits. Larger cistern systems require plumbing permits for potable or irrigation use.
California AB 1750, the Rainwater Capture Act of 2012, authorizes property owners to collect and use rainwater from rooftops for non-potable purposes such as landscape irrigation, toilet flushing, and washing. Sunnyvale follows this state framework and generally allows rain barrels up to about 50 gallons without a permit when installed on stable ground, screened to prevent mosquito breeding, and overflow directed away from foundations. Larger cisterns over 5000 gallons or systems integrated with household plumbing require a plumbing permit through the Sunnyvale Building Safety Division. Rainwater cannot be used for drinking unless treated to potable standards. Valley Water offers rebates through the Rain Barrel and Cistern Rebate Program for qualified installations.
Contact your local code enforcement office for specific penalty information.
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Side-by-side rule comparisons with other cities in Santa Clara County.
See how other cities in Santa Clara County handle rainwater harvesting.
See how Sunnyvale's rainwater harvesting rules stack up against other locations.
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