Portland actively encourages rainwater harvesting; rain barrels and cisterns for outdoor irrigation are allowed with minimal regulation, and indoor use is permitted under Oregon Plumbing Specialty Code.
The Portland Bureau of Environmental Services promotes rainwater harvesting as part of Clean Rivers and stormwater management. Rain barrels up to 50 gallons per downspout need no permit. Cisterns greater than 50 gallons or used indoors (toilet flushing, laundry) require an Oregon Plumbing Specialty Code permit and backflow prevention. Portland offers stormwater utility fee discounts through the Clean River Rewards program for approved systems that reduce runoff. The Bureau of Development Services reviews structural support for large cisterns. Rainwater collected for potable use requires treatment and disinfection to the Oregon Health Authority standard.
Specific penalty amounts for this ordinance are not published in a publicly accessible fine schedule. Contact Portland code enforcement directly for current fines, enforcement procedures, and hearing options.
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See how Portland's rainwater harvesting rules stack up against other locations.
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