East Honolulu permits residential rainwater harvesting. No Honolulu ordinance restricts collection, and the Board of Water Supply offers rebates attractive for large Hawaii Kai and Aina Haina lots.
East Honolulu's Kona-side rainfall patterns make rain barrels practical for landscape irrigation on larger lots in Hawaii Kai, Kuliouou, and Aina Haina. The City and County of Honolulu has no specific ordinance regulating residential rainwater harvesting, and Hawaii does not restrict collection. Exterior systems for outdoor irrigation with storage up to 360 gallons do not require a plumbing permit under the Hawaii Plumbing Code (2018 UPC Chapter 16). The Honolulu Board of Water Supply offers rain barrel rebates. Guidance is available through the University of Hawaii CTAHR Rainwater Catchment Systems Program.
No ordinance-based violations for simple outdoor catchment; indoor/potable systems that connect to household plumbing require permits and health compliance.
East Honolulu, HI
East Honolulu pool owners in Hawaii Kai, Portlock, and Aina Haina must install code-compliant barriers under ROH Sec. 16-6.2, with public pools in the CDP su...
East Honolulu, HI
East Honolulu retaining walls on Kuliouou, Hawaii Loa Ridge, and Niu Valley hillsides fall under ROH 21-4.40, which caps fill-bearing walls in required yards...
East Honolulu, HI
East Honolulu fence materials follow the LUO definition embedded in ROH 21-4.60, allowing wrought iron, wood, vinyl, plastic, and wire with post foundations ...
East Honolulu, HI
East Honolulu neighbor fence disputes fall under ROH 21-4.30 yard setbacks combined with 21-4.60 height limits, since Hawaii has no dedicated spite fence sta...
East Honolulu, HI
Public parks in East Honolulu, including Koko Head and Hawaii Kai area beach parks, are closed during posted night hours. Entering closed parks is prohibited...
East Honolulu, HI
East Honolulu follows the Hawaii state juvenile curfew under HRS 577-16. Children under 16 cannot be in public places between 10 pm and 4 am without a parent...
Side-by-side rule comparisons with other cities in Honolulu County.
See how other cities in Honolulu County handle rainwater harvesting.
See how East Honolulu's rainwater harvesting rules stack up against other locations.
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