Kaneohe vs Mililani Town
How do rainwater harvesting rules compare between Kaneohe, HI and Mililani Town, HI?
Kaneohe and Mililani Town have similar restriction levels.
Kaneohe, HI
Honolulu County
Kaneohe's high rainfall makes rainwater collection practical; exterior systems up to 360 gallons need no permit, and BWS offers rain barrel rebates.
View full Kaneohe 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 | Kaneohe | 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.
Kaneohe FAQ
Should Kaneohe homeowners size rain barrels larger than 360 gallons?
Often yes, given local rainfall. Tanks over 360 gallons or plumbed indoors need permits and backflow devices, but the extra storage pays off quickly.
Can I water my Hoomaluhia-adjacent yard from catchment?
Yes. Outdoor irrigation from rainwater is unregulated by ROH, and BWS encourages it as a drought-resilient source for windward gardens.
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.
Compare other topics
See how Kaneohe and Mililani Town compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool