East Honolulu vs Kaneohe
How do rainwater harvesting rules compare between East Honolulu, HI and Kaneohe, HI?
East Honolulu and Kaneohe have similar restriction levels.
East Honolulu, HI
Honolulu County
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.
View full East Honolulu rules →Kaneohe, HI
Honolulu County
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 →Key Facts Comparison
| Fact | East Honolulu | Kaneohe |
|---|---|---|
| Ordinance | None specific to harvesting | - |
| Permit-free limit | Up to 360 gallons outdoor | - |
| Rebates | Board of Water Supply offers | BWS rain barrel program |
| Guidance | UH CTAHR catchment program | - |
| Permit threshold | - | 360 gallons storage |
| Code reference | - | Hawaii Plumbing Code Ch. 16 |
| Indoor use | - | Requires plumbing permit |
Highlighted rows indicate differences between cities.
East Honolulu FAQ
Do I need a permit for a rain barrel in Hawaii Kai?
No. Outdoor catchment for irrigation with storage up to 360 gallons is exempt from plumbing permits and no Honolulu ordinance restricts it.
Can I use collected rainwater for drinking?
Potable use systems must meet Hawaii Department of Health standards and typically require treatment. Most East Honolulu residents use catchment only for landscape irrigation.
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.
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