Mililani Town vs Waipahu
How do stormwater management rules compare between Mililani Town, HI and Waipahu, HI?
Mililani Town and Waipahu have similar restriction levels.
Mililani Town, HI
Honolulu County
Mililani stormwater is regulated under ROH Chapter 43 Article 11, which prohibits most non-stormwater discharges to the city's separate storm sewer flowing to Waikele Stream.
View full Mililani Town rules →Waipahu, HI
Honolulu County
Waipahu's dense neighborhoods discharge stormwater toward Pearl Harbor and must comply with ROH Chapter 43, Article 11, which prohibits non-stormwater discharges to the city's MS4 system.
View full Waipahu rules →Key Facts Comparison
| Fact | Mililani Town | Waipahu |
|---|---|---|
| - | - |
Highlighted rows indicate differences between cities.
Mililani Town FAQ
Can I wash my car in my Mililani driveway?
Occasional washing on grass is generally fine, but detergent-laden runoff flowing into the street drain is a prohibited discharge.
Is yard fertilizer regulated?
Over-applying fertilizer so runoff reaches the storm drain can be cited; follow label rates and sweep granules off hard surfaces.
Waipahu FAQ
What is an illicit stormwater discharge in Waipahu?
Any non-stormwater flow into the city storm drain, such as soapy water, chemicals, paint, or wastewater, is classified as an illicit discharge prohibited under Sec. 43-11.22.
What if my business rinses equipment outside?
Outdoor rinsing that drains to a storm inlet violates Sec. 43-11.22. Rinse water must be captured, directed to sanitary sewer with permission, or contained to prevent storm drain entry.
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