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Santa Clara County, CA Landscaping Rules: Rainwater Harvesting (2026)

Few Restrictions

Verified 1 month ago|Source: Valley Water Rebates →

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Key Facts

Enabling law: AB 1750 Rainwater Capture Act
Rain barrel permit: Generally not required
Large tank permit: Over 5,000 gallons
Mosquito rule: Covered with fine mesh
Rebate program

City-specific rules exist: Palo Alto, Mountain View, Santa Clara, and Sunnyvale have their own rainwater harvesting rules that differ from Santa Clara County's county-level regulations. If you live in one of those cities, check the city-specific page instead.

Summary

California AB 1750 Rainwater Capture Act allows rooftop rainwater harvesting without a water rights permit. Santa Clara County permits rain barrels freely, with building permits required for tanks over 5,000 gallons.

Full Breakdown

Rainwater harvesting is encouraged in Santa Clara County as a water conservation strategy. The California Rainwater Capture Act of 2012 (AB 1750) allows residential, commercial, and governmental rooftop rainwater harvesting without requiring a water rights permit from the State Water Resources Control Board. Small-scale systems such as rain barrels under 100 gallons and above-ground cisterns typically do not require a building permit when placed on compacted gravel or concrete pads, though setbacks from property lines and structures must be observed. Tanks larger than 5,000 gallons, tanks mounted on structures, or systems plumbed into a home require building and plumbing permits. When used for indoor potable purposes, harvested water must be treated and kept in a separate plumbing system with cross-connection controls; outdoor irrigation use is more common and simpler. Valley Water offers rebates for rain barrels and graywater-ready irrigation systems. Mosquito abatement rules require covered tanks with fine screen mesh to prevent breeding.

Frequently Asked Questions

Can I use harvested rainwater for drinking or showering?

Only with proper treatment (filtration and disinfection) and a dedicated plumbing system with backflow prevention. Most residential systems are limited to outdoor irrigation and toilet flushing to simplify code compliance.

Do I need a setback for my rain barrel?

Follow standard accessory-structure setbacks from property lines (typically 3 feet) and avoid blocking access or drainage paths. Small barrels under 100 gallons on a firm pad are generally unregulated.

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Santa Clara County, CA Landscaping Rules: Rainwater Harvesting (2026)

Key Facts

Summary

AB 1750 (2012) — Rainwater Capture Act

Full Breakdown

Violations & Fines

Frequently Asked Questions

Sources & Official References

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