East Honolulu vs Kapolei
How do rainwater harvesting rules compare between East Honolulu, HI and Kapolei, HI?
East Honolulu and Kapolei 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 →Kapolei, HI
Honolulu County
Kapolei residents may install residential rain barrels without a Honolulu ordinance permit; small catchment up to 360 gallons is exempt under state plumbing code.
View full Kapolei rules →Key Facts Comparison
| Fact | East Honolulu | Kapolei |
|---|---|---|
| Ordinance | None specific to harvesting | - |
| Permit-free limit | Up to 360 gallons outdoor | - |
| Rebates | Board of Water Supply offers | - |
| Guidance | UH CTAHR catchment program | - |
| City code | - | No specific ordinance |
| Plumbing code | - | Up to 360 gallons exempt |
| Incentive | - | BWS rebate programs |
| Climate fit | - | Dry leeward offset |
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.
Kapolei FAQ
Do I need a Kapolei permit for a rain barrel?
No. Residential outdoor catchment under 360 gallons is exempt under Hawaii Plumbing Code, and Honolulu has no specific ordinance for Kapolei residential catchment.
Can Kapolei businesses install large cisterns?
Yes, but larger commercial systems may require plumbing permit review if they exceed the 360-gallon exterior irrigation exemption under the Hawaii Plumbing Code.
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