Ewa Gentry vs Mililani Town
How do rainwater harvesting rules compare between Ewa Gentry, HI and Mililani Town, HI?
Ewa Gentry and Mililani Town 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 →Mililani Town, HI
Honolulu County
Mililani Town residents can collect rainwater for outdoor use without a permit up to 360 gallons; HOA rules may affect visible barrel placement.
View full Mililani Town rules →Key Facts Comparison
| Fact | Ewa Gentry | Mililani Town |
|---|---|---|
| City code | No specific ordinance | - |
| Plumbing code | Up to 360 gallons exempt | - |
| Incentive | BWS rain barrel rebates | - |
| HOA layer | Gentry aesthetic rules apply | MTA architectural rules |
| Permit threshold | - | 360 gallons storage |
| Code reference | - | Hawaii Plumbing Code Ch. 16 |
| Rebates | - | BWS rain barrel program |
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.
Mililani Town FAQ
Does Mililani Town Association allow rain barrels?
Generally yes, with placement and color guidelines. Submit an architectural application to the MTA before installation to avoid compliance letters.
Can I plumb rainwater to my Mililani washing machine?
Only with a plumbing permit and proper backflow protection. Non-potable indoor use is regulated under the Hawaii Plumbing Code.
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