Kailua vs Mililani Town
How do rainwater harvesting rules compare between Kailua, HI and Mililani Town, HI?
Kailua and Mililani Town have similar restriction levels.
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 →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 | Kailua | Mililani Town |
|---|---|---|
| Permit threshold | 360 gallons storage | 360 gallons storage |
| Code reference | Hawaii Plumbing Code Ch. 16 | Hawaii Plumbing Code Ch. 16 |
| Rebates | BWS rain barrel program | BWS rain barrel program |
| Indoor use | Requires plumbing permit | - |
| HOA layer | - | MTA architectural rules |
Highlighted rows indicate differences between cities.
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.
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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