Ewa Gentry vs Kailua
How do rainwater harvesting rules compare between Ewa Gentry, HI and Kailua, HI?
Ewa Gentry and Kailua have similar restriction levels.
Ewa Gentry, HI
Honolulu County
Ewa Gentry homeowners may install residential rain barrels and catchment without a Honolulu ordinance permit; state plumbing code allows small systems under 360 gallons.
View full Ewa Gentry rules →Kailua, HI
Honolulu County
Kailua residents can collect rainwater for outdoor irrigation without a permit; the Board of Water Supply offers rebates for rain barrels on windward lots.
View full Kailua rules →Key Facts Comparison
| Fact | Ewa Gentry | Kailua |
|---|---|---|
| City code | No specific ordinance | - |
| Plumbing code | Up to 360 gallons exempt | - |
| Incentive | BWS rain barrel rebates | - |
| HOA layer | Gentry aesthetic rules apply | - |
| Permit threshold | - | 360 gallons storage |
| Code reference | - | Hawaii Plumbing Code Ch. 16 |
| Rebates | - | BWS rain barrel program |
| Indoor use | - | Requires plumbing permit |
Highlighted rows indicate differences between cities.
Ewa Gentry FAQ
Do I need a permit for a rain barrel in Ewa Gentry?
No. Small outdoor catchment under 360 gallons is exempt under Hawaii Plumbing Code, and Honolulu has no residential catchment ordinance for Ewa Gentry homes.
Will my Gentry HOA allow a rain barrel?
Most allow screened barrels in side or back yards. Check your Gentry subdivision design guidelines before placing barrels visible from the street.
Kailua FAQ
Can I install rain barrels on my Kailua home?
Yes. Exterior barrels up to 360 gallons for outdoor irrigation are allowed without a permit. BWS offers rebates to offset purchase costs.
Can I plumb harvested water into my Kailua kitchen?
Only with a plumbing permit and proper backflow protection. Indoor use is treated as a non-potable supply under the Hawaii Plumbing Code.
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