Rooftop rainwater harvesting is broadly allowed in unincorporated Santa Barbara County. No County ordinance prohibits rain barrels, which are exempt from permitting under California's Rainwater Capture Act, while larger cistern and conveyance systems must meet California Plumbing Code standards.
Santa Barbara County does not have an ordinance restricting residential rainwater harvesting; the framework is set by California state law, which the County implements through building and plumbing permits. Under California's Rainwater Capture Act (Water Code Section 10573, AB 1750) and State Water Resources Control Board guidance, capturing rainwater from rooftops for on-site, non-potable landscape use does not require a state water-right permit. Simple rain barrels and small above-ground catchment that do not alter existing plumbing are not permitted as building work. Larger storage — elevated tanks, cisterns and any system tied into a building's plumbing or used indoors — must comply with the rainwater-catchment provisions of the California Plumbing Code (which the County adopts under Chapter 10 of the County Code) and may require a plumbing or building permit through Planning and Development's Building and Safety Division. Because Santa Barbara County is in a chronically water-short region, rainwater capture is encouraged as a conservation measure and complements the County's WELO landscape-efficiency goals. We did not find a County-specific rain-barrel ordinance, so homeowners should confirm tank size and plumbing-connection thresholds with Building and Safety before installing larger systems.
There is no County penalty for installing ordinary rain barrels. Building or plumbing code violations arise only if a larger cistern or a plumbed-in system is installed without a required permit or fails to meet the California Plumbing Code; these are enforced by the County Building and Safety Division through the standard building-code correction and penalty process.
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