Santa Clara, CA Landscaping Rules: Rainwater Harvesting (2026)
Key Facts
- State framework
- Rainwater Capture Act
- Small barrels
- Under 5000 gal no permit
- Large cisterns
- Building + plumbing permit
- Indoor use
- Must meet CPC Ch 17
- Rebate
- Valley Water rain barrel rebate
Summary
Santa Clara allows rainwater harvesting under the CA Rainwater Capture Act. Rain barrels under 5,000 gallons typically need no permit, but larger cisterns and pumps do.
AB 1750, Solorio. Rainwater Capture Act of 2012. (1) Under existing law, the State Water Resources Control Board (state board) and the California regional water quality control boards prescribe waste discharge requirements for the discharge of stormwater in accordance with the national pollutant discharge elimination system (NPDES) permit program and the Porter-Cologne Water Quality Control Act. Under existing law, the state board administers a water rights program pursuant to which the state board grants permits and licenses to appropriate water, upon an application to appropriate water. This bill would enact the Rainwater Capture Act of 2012, which would provide that use of rainwater collected from rooftops does not require a water right permit from the state board.
Full Breakdown
California's Rainwater Capture Act (SB 1750 / AB 1750) and related CPC provisions allow residents to capture rainwater from roof surfaces for outdoor non-potable use without a water right permit. In Santa Clara, small above-ground rain barrels and tanks generally do not require a building permit if they are under 5,000 gallons, freestanding, and not connected to the potable plumbing system. Tanks over 5,000 gallons, underground cisterns, and any system with pumps tied into the home's plumbing or using rainwater for indoor non-potable uses require building and plumbing permits under the California Plumbing Code Chapter 17. Overflow must be directed to landscaped areas or the storm system without creating nuisance runoff onto neighbors. Valley Water offers rebates for qualifying rain barrels and cisterns.
Frequently Asked Questions
Can I drink harvested rainwater?
Do HOA rules override this?
Sources & Official References
Other rules in Santa Clara
California rules heatmap·Compare Santa Clara to another location·View the California landscaping rules overview
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Rainwater Harvesting in Nearby Cities
How other cities in Santa Clara County handle rainwater harvesting.