Stormwater Management: Mililani Mauka vs Waipahu
How do stormwater management rules compare between Mililani Mauka, HI and Waipahu, HI?
Mililani Mauka and Waipahu have similar restriction levels.
Mililani Mauka, HI
Honolulu County
Mililani Mauka properties connected to the city's separate storm sewer system fall under ROH Chapter 43, Article 11, which bars non-stormwater discharges and enforces MS4 water quality rules.
View full Mililani Mauka 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 Mauka | Waipahu |
|---|---|---|
| - | - |
Highlighted rows indicate differences between cities.
Mililani Mauka FAQ
Can I drain my Mililani Mauka pool into a storm drain?
No. Chlorinated pool water is a prohibited non-stormwater discharge under Sec. 43-11.22 and must be dechlorinated and discharged according to city guidance.
What about washing paint brushes in my driveway?
Paint and solvent residues that reach the storm drain are prohibited discharges; clean brushes in a sink connected to the sanitary sewer instead.
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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