Stormwater Management: Mililani Mauka vs Urban Honolulu
How do stormwater management rules compare between Mililani Mauka, HI and Urban Honolulu, HI?
Mililani Mauka and Urban Honolulu 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 →Urban Honolulu, HI
Honolulu County
In Urban Honolulu's redevelopment zones from Kakaako to Ala Moana, ROH Chapter 43 Article 11 and Chapter 14 water quality rules require strict MS4 compliance, with illicit discharge prohibitions enforced at construction and operation stages.
View full Urban Honolulu rules →Key Facts Comparison
| Fact | Mililani Mauka | Urban Honolulu |
|---|---|---|
| - | - | |
| Authority | - | ROH Ch. 43 Art. 11 |
| Connection rule | - | Sec. 43-11.12 |
| Illicit discharge | - | Sec. 43-11.22 |
| Receiving waters | - | Ala Wai, Kewalo, harbor |
| Projects | - | Kakaako, Ala Moana towers |
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.
Urban Honolulu FAQ
Do Urban Honolulu tower projects need post-construction stormwater controls?
Yes. City water quality rules require permanent treatment such as bioretention, cisterns, or media filters for qualifying new and redevelopment projects, on top of construction-phase BMPs.
Can my condo discharge cooling-tower blowdown to the storm drain?
No. Sec. 43-11.22 prohibits non-stormwater discharges including cooling tower blowdown, which must be routed to sanitary sewer under a permit rather than the MS4.
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