Stormwater Management: Ewa Gentry vs Urban Honolulu
How do stormwater management rules compare between Ewa Gentry, HI and Urban Honolulu, HI?
Ewa Gentry and Urban Honolulu have similar restriction levels.
Ewa Gentry, HI
Honolulu County
Ewa Gentry properties connecting to the city's separate storm sewer system are regulated by ROH Chapter 43, Article 11, which prohibits non-stormwater discharges and implements MS4 water quality standards.
View full Ewa Gentry 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 | Ewa Gentry | 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.
Ewa Gentry FAQ
Can I drain my pool into the street in Ewa Gentry?
No. Chlorinated pool water is a prohibited non-stormwater discharge under Sec. 43-11.22 and must be dechlorinated and disposed of properly.
Is washing my car in the driveway allowed?
Residential car washing is generally tolerated, but soapy runoff to the storm drain can still violate water quality standards if it carries pollutants.
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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