Urban Honolulu has no ordinance restricting rainwater harvesting; Board of Water Supply rebates target rain barrels at single-family homes in Kaimuki, Manoa, and Palolo rather than high-rise condos.
The City and County of Honolulu does not regulate residential rainwater catchment; Hawaii law permits collection statewide. Under the Hawaii Plumbing Code (2018 UPC Chapter 16), exterior rainwater catchment up to 360 gallons for outdoor irrigation is exempt from plumbing permits. In the urban core, single-family neighborhoods like Kaimuki, Manoa, and Palolo are the typical rebate candidates because high-rise condos in Waikiki, Kakaako, and Ala Moana lack space and rooftop access for barrels. The Honolulu Board of Water Supply rebate program and UH CTAHR guidance remain the primary resources.
No specific violations apply to residential harvesting; larger systems or potable-plumbing tie-ins must meet standard building and plumbing code requirements.
Urban Honolulu, HI
ROH 15-14.5 drives Schedule XXII no-parking signs throughout Urban Honolulu, while ROH 15-13.5 sets how close to the curb vehicles must park.
Urban Honolulu, HI
LUO 21-6.60 requires EV-ready stalls in new multi-family (8+ stalls) and commercial (12+ stalls) parking across Urban Honolulu, with compact resizing allowed...
Urban Honolulu, HI
ROH 15-16.6 prohibits storage parking of commercial vehicles on Urban Honolulu streets without posted signs; LUO 21-6.20 sets the companion off-street parkin...
Urban Honolulu, HI
Urban Honolulu has no blanket overnight parking ban; ROH 15-14.6 enforces parking prohibited during certain hours only on sign-posted routes.
Urban Honolulu, HI
ROH 15-14.1 prohibits stopping, standing, or parking in front of any public or private driveway or within 4 feet of either side across dense Urban Honolulu n...
Urban Honolulu, HI
Urban Honolulu property owners obtain fence and wall permits from the Honolulu Department of Planning and Permitting under ROH 18-3.1, which exempts retainin...
Side-by-side rule comparisons with other cities in Honolulu County.
See how other cities in Honolulu County handle rainwater harvesting.
See how Urban Honolulu's rainwater harvesting rules stack up against other locations.
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