Waipahu allows residential rainwater harvesting with no ordinance restriction. Rain barrels suit tight plantation-era lots, and the Board of Water Supply offers rebates.
Waipahu's leeward rainfall is modest, but roof runoff from a typical plantation-era cottage can still supply meaningful irrigation water for vegetable gardens popular with Waipahu's Filipino and Pacific Islander households. The City and County of Honolulu has no specific ordinance regulating residential rainwater harvesting, and Hawaii does not restrict collection. Outdoor-irrigation catchment 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. Guidance is available from the University of Hawaii CTAHR Rainwater Catchment Systems Program.
No ordinance-based violations for standard outdoor catchment; systems connecting to indoor plumbing must meet plumbing code and health regulations.
Waipahu, HI
Waipahu residential pools must be enclosed under ROH Sec. 16-6.2, with companion public-pool standards at 16-7.9 covering apartment complexes and condominium...
Waipahu, HI
Waipahu retaining walls fall under ROH 21-4.40, capping fill-bearing walls in required yards at 6 feet with terraced heights combined, impacting stream-side ...
Waipahu, HI
Waipahu fences follow the LUO fence definition in ROH 21-4.60, allowing wrought iron, wood, vinyl, plastic, and wire on post foundations, with chain-link com...
Waipahu, HI
Waipahu neighbor fence disputes apply ROH 21-4.30 yard setbacks with 21-4.60 height limits, since Hawaii has no dedicated spite fence statute for Waipahu's t...
Waipahu, HI
Public parks in Waipahu, including Waipahu District Park and Hans L'Orange Park, are closed during posted night hours. Entering closed parks is prohibited, t...
Waipahu, HI
Waipahu follows 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 or guardian.
Side-by-side rule comparisons with other cities in Honolulu County.
See how other cities in Honolulu County handle rainwater harvesting.
See how Waipahu's rainwater harvesting rules stack up against other locations.
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