Pearl City allows residential rainwater harvesting with no ordinance restriction. Rain barrels are practical for yards in Pacific Palisades and Manana, with BWS rebates available.
Pearl City's moderate rainfall on the Koolau foothill side, especially in Pacific Palisades and upper Manana, supports simple rain barrel systems well. The City and County of Honolulu has no specific ordinance regulating residential rainwater harvesting, and Hawaii does not restrict collection. Exterior outdoor-irrigation catchment with storage up to 360 gallons does not require a plumbing permit under the Hawaii Plumbing Code (2018 UPC Chapter 16). The Honolulu Board of Water Supply offers rain barrel rebates that are popular with cost-conscious military families. Guidance is available from the University of Hawaii CTAHR Rainwater Catchment Systems Program.
No ordinance-based violations for standard outdoor catchment; systems connected to indoor plumbing must follow plumbing code and health regulations.
See how other cities in Honolulu County handle rainwater harvesting.
See how Pearl City's rainwater harvesting rules stack up against other locations.
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