East Honolulu vs Honolulu
How do rainwater harvesting rules compare between East Honolulu, HI and Honolulu, HI?
East Honolulu and Honolulu 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 →Honolulu, HI
Honolulu County
Honolulu County has no ordinance restricting residential rainwater harvesting; the Board of Water Supply encourages it countywide through a rain barrel rebate program and CTAHR catchment guidelines.
View full Honolulu rules →Key Facts Comparison
| Fact | East Honolulu | Honolulu |
|---|---|---|
| Ordinance | None specific to harvesting | - |
| Permit-free limit | Up to 360 gallons outdoor | - |
| Rebates | Board of Water Supply offers | - |
| Guidance | UH CTAHR catchment program | - |
| County ordinance | - | None |
| Permit threshold | - | Up to 360 gallons exempt |
| Rebate program | - | Board of Water Supply |
| Guidelines | - | UH CTAHR catchment program |
| State restrictions | - | None |
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.
Honolulu FAQ
Do I need a permit for a backyard rain barrel on Oahu?
Usually no. Exterior catchment up to 360 gallons for outdoor irrigation is exempt under the Hawaii Plumbing Code, and Honolulu County has no separate ordinance.
Are there incentives for catching rainwater?
Yes. The Honolulu Board of Water Supply runs a rain barrel rebate program encouraging conservation. Details and eligibility are posted on the BWS website.
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