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🌿 Landscaping Rules/Rainwater Harvesting

Kaneohe vs Waipahu

How do rainwater harvesting rules compare between Kaneohe, HI and Waipahu, HI?

Kaneohe and Waipahu have similar restriction levels.

Kaneohe, HI

Honolulu County

Few Restrictions

Kaneohe's high rainfall makes rainwater collection practical; exterior systems up to 360 gallons need no permit, and BWS offers rain barrel rebates.

View full Kaneohe rules β†’

Waipahu, HI

Honolulu County

Few Restrictions

Waipahu allows residential rainwater harvesting with no ordinance restriction. Rain barrels suit tight plantation-era lots, and the Board of Water Supply offers rebates.

View full Waipahu rules β†’

Key Facts Comparison

FactKaneoheWaipahu
Permit threshold360 gallons storage-
Code referenceHawaii Plumbing Code Ch. 16-
RebatesBWS rain barrel programBoard of Water Supply offers
Indoor useRequires plumbing permit-
Ordinance-None specific to harvesting
Permit-free limit-Up to 360 gallons outdoor
Guidance-UH CTAHR catchment program

Highlighted rows indicate differences between cities.

Kaneohe FAQ

Should Kaneohe homeowners size rain barrels larger than 360 gallons?

Often yes, given local rainfall. Tanks over 360 gallons or plumbed indoors need permits and backflow devices, but the extra storage pays off quickly.

Can I water my Hoomaluhia-adjacent yard from catchment?

Yes. Outdoor irrigation from rainwater is unregulated by ROH, and BWS encourages it as a drought-resilient source for windward gardens.

Waipahu FAQ

Can a Waipahu rental property install a rain barrel?

Only with landlord permission. No ordinance prohibits it, but tenancy and any HOA rules govern yard additions on rental properties.

Is catchment water safe for a Waipahu backyard garden?

Yes for irrigation of non-root, non-leaf-eaten crops. Follow UH CTAHR guidance for safer watering of vegetables meant to be eaten raw.

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