Fullerton, CA Landscaping Rules: Rainwater Harvesting (2026)

California's Rainwater Capture Act of 2012 (Water Code Sections 10570-10574) establishes a statewide right for property owners to collect and use rainwater falling on their rooftops. This state law preempts any local restrictions that would prohibit basic residential rainwater harvesting. In Fullerton, residents may install rain barrels and cisterns to capture roof runoff without obtaining a building permit, provided the system meets basic requirements: containers must be covered or screened to prevent mosquito breeding (consistent with Orange County Vector Control District standards), must not create a structural or safety hazard, and must not discharge onto neighboring properties. Rain barrels are typically placed beneath downspout diverters on the side or rear of the home. Larger cistern systems (generally above 5,000 gallons) or pressurized systems may require a plumbing permit from the Fullerton Building Division. Collected rainwater may be used for landscape irrigation, garden watering, and other non-potable outdoor purposes. It may not be used for drinking water without treatment. The Municipal Water District of Orange County and the Orange County Water District periodically offer rain barrel distribution programs and rebates as part of regional stormwater capture and water conservation initiatives. Fullerton's low-impact development (LID) standards for new construction also encourage on-site stormwater retention through bioswales, permeable paving, and rain gardens.