Environmental Rules in Urban Honolulu, HI (2026)
5 verified environmental rules for Urban Honolulu, Hawaii, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
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.
Kakaako and Ala Moana Stormwater Rules Under MS4
Heavy RestrictionsErosion Control
Urban Honolulu tower and infill projects in Kakaako, Ala Moana, and Waikiki must submit erosion and sediment control plans under ROH Sec. 18A-1.6, protecting tight streets and storm drains that discharge directly to sensitive coastal waters.
Erosion and Sediment Controls for Urban Honolulu Construction
Heavy RestrictionsCoastal Development
Urban Honolulu's coastal zones, including Waikiki, Kakaako makai, and Ala Moana Beach Park frontage, fall within the Special Management Area, where ROH Chapter 25 requires SMA major or minor permits for most development.
SMA Permits for Waikiki and Ala Moana Projects
Heavy RestrictionsFlood Zones
Urban Honolulu's Mapunapuna, Waikiki fringe, and Kakaako makai properties lie in FEMA special flood hazard areas adopted under ROH Sec. 21A-1.5, with elevation and floodproofing required under Sec. 21A-1.8.
Urban Honolulu Flood Zones in Mapunapuna and Waikiki
Heavy RestrictionsGrading & Drainage
Tower excavations and infill projects in Urban Honolulu must obtain grading permits under ROH Chapter 18A, with dewatering, shoring, and drainage coordination critical in Kakaako and Ala Moana's high water-table conditions.
Grading and Drainage Permits in Urban Honolulu
Heavy RestrictionsLooking for Honolulu County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Urban Honolulu city rules.
Environmental Rules in Honolulu County →