Rooftop rainwater collection is broadly allowed in Washington, and Pierce County has no ordinance prohibiting residential rain barrels or cisterns; larger systems or those used for potable or plumbed uses may trigger plumbing-permit and Health Department review.
Washington State supports rooftop rainwater harvesting: a landowner may collect rainwater from their roof surface without a water right under Department of Ecology policy, and Pierce County Code contains no chapter prohibiting residential rain barrels or cisterns. Simple rain barrels for landscape irrigation are effectively unregulated at the county level. Regulation attaches only to larger or integrated systems: cisterns plumbed into a building, used indoors, or intended for potable use fall under the state plumbing code (Title 17C) and, for drinking water, under Health Department review. Rainwater capture is also encouraged as a stormwater low-impact-development practice in the county's Site Development Manual. Because no county code restricts rainwater harvesting, this cites the enabling framework, not a prohibition.
There is no penalty for ordinary outdoor rain-barrel use. Installing a plumbed, indoor, or potable rainwater system without required plumbing permits or Health Department approval can be cited under Title 17C PCC and state drinking-water rules, with correction required.
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