San Diego County, CA Landscaping Rules: Rainwater Harvesting (2026)
Key Facts
- Legal to harvest?
- Yes - broadly allowed and encouraged
- Controlling law
- CA Rainwater Capture Act of 2012 (AB 1750)
- Water-right permit
- Not required for rooftop, non-potable use
- Permit-exempt size
- Rain barrels/cisterns under 360 gallons
- When permits apply
- Large, elevated, plumbed, or potable-use systems
Summary
Rainwater harvesting is broadly allowed in unincorporated San Diego County. Under California's Rainwater Capture Act of 2012, no state water-right permit is needed to collect rooftop rainwater for outdoor non-potable use, and rain barrels under 360 gallons generally need no building permit. The county encourages capture for landscape irrigation.
to read: PART 2.4. Rainwater Capture Act of 2012 10570. This part shall be known, and may be cited, as the Rainwater Capture Act of 2012. 10571. The Legislature finds and declares all of the following: (a) As California has grown and developed, the amount of stormwater flowing off buildings, parking lots, roads, and other impervious surfaces into surface water streams, flood channels, and storm sewers has increased, thereby reducing the volume of water allowed to infiltrate into groundwater aquifers and increasing water and pollution flowing to the ocean and other surface waters. At the same time, recurring droughts and water shortages in California have made local water supply augmentation and water conservation efforts a priority.
Full Breakdown
Rainwater capture is legal and encouraged for residents of unincorporated San Diego County, and there is no county ordinance prohibiting it. The controlling law is California's Rainwater Capture Act of 2012 (AB 1750), which authorizes residential, commercial, and governmental landowners to install and operate rain barrels and rainwater-capture systems. It clarifies that collecting rainwater from rooftops for outdoor, non-potable use does not require a water-right permit from the State Water Resources Control Board. Small systems are largely exempt from permitting: rain barrels and cisterns capturing rooftop runoff for landscape irrigation are generally unregulated where capacity is below 360 gallons.
Larger cisterns, elevated tanks, systems plumbed into a building, or systems intended for any indoor or potable use can trigger California Plumbing Code and county building-permit requirements, so check with County Planning & Development Services for tanks above that threshold or for structural mounting. Captured rainwater pairs well with the county's water-efficiency goals and can help meet the landscape water budget under the Water Conservation in Landscaping Ordinance. Always keep barrels covered and screened to prevent mosquito breeding, which the County Vector Control program addresses separately.
Violations & Fines
Most simple rain-barrel setups are exempt and carry no penalty. Installing a large or plumbed cistern without a required building or plumbing permit, or creating standing water that breeds mosquitoes, can prompt code enforcement or a Vector Control notice.
Frequently Asked Questions
Do I need a permit for a rain barrel in unincorporated San Diego County?
Can I use captured rain to water my yard?
Sources & Official References
Other rules in San Diego County
California rules heatmap·Compare San Diego County to another location·View the California landscaping rules overview
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