Kapolei residents may install residential rain barrels without a Honolulu ordinance permit; small catchment up to 360 gallons is exempt under state plumbing code.
The City and County of Honolulu has no specific ordinance regulating residential rainwater harvesting in Kapolei or elsewhere on Oahu. Hawaii does not restrict rainwater collection, and neither the Board of Water Supply nor the Department of Health regulates individual residential catchment. Under the Hawaii Plumbing Code based on the 2018 UPC Chapter 16, outdoor irrigation catchment systems with storage up to 360 gallons do not need a permit. Kapolei's dry leeward climate means rain barrels help offset landscape irrigation during the wet season. BWS has offered rain barrel rebates, and commercial Kapolei projects may combine catchment with cistern systems sized for their plans and reviewed as plumbing work.
No ordinance penalties apply for compliant catchment. Larger commercial Kapolei cistern systems may need plumbing plan review if they exceed code exemptions.
Kapolei, HI
ROH Sec. 16-6.2 requires Kapolei residential swimming pools to be enclosed by a complete barrier with self-closing gates designed to prevent access by young ...
Kapolei, HI
ROH Sec. 21-4.40 limits fill-containing retaining walls in Kapolei to six feet within required yards and combines terraced wall heights for compliance measur...
Kapolei, HI
ROH Sec. 21-4.60 defines fences to include wrought iron, wire, wood, vinyl, and plastic, giving Kapolei residents a broad palette of compliant materials.
Kapolei, HI
ROH Sec. 21-4.30 controls what Kapolei neighbors can install in required yards along shared property lines, since Honolulu does not have a dedicated city spi...
Kapolei, HI
Public parks in Kapolei are closed during posted night hours under ROH Sec. 10-1.2, though beach parks allow direct traverse to the shoreline during closure.
Kapolei, HI
Kapolei follows HRS Sec. 577-16, which bars children under 16 from public places between 10 p.m. and 4 a.m. without a parent or guardian; Honolulu has no sep...
Side-by-side rule comparisons with other cities in Honolulu County.
See how other cities in Honolulu County handle rainwater harvesting.
See how Kapolei's rainwater harvesting rules stack up against other locations.
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