Flood Zones: East Honolulu vs Mililani Mauka
How do flood zones rules compare between East Honolulu, HI and Mililani Mauka, HI?
Mililani Mauka has fewer restrictions than East Honolulu.
East Honolulu, HI
Honolulu County
Development in East Honolulu's FEMA-mapped flood zones falls under ROH Chapter 21A, which governs special flood hazard areas, flood fringe elevation standards, and flood variance procedures.
View full East Honolulu rules →Mililani Mauka, HI
Honolulu County
Most Mililani Mauka parcels sit on elevated terrain outside special flood hazard areas, but ROH Chapter 21A still governs any properties mapped within FEMA flood zones.
View full Mililani Mauka rules →Key Facts Comparison
| Fact | East Honolulu | Mililani Mauka |
|---|---|---|
| - | - |
Highlighted rows indicate differences between cities.
East Honolulu FAQ
How do I know if my Aina Haina home is in a flood zone?
Check the FEMA Flood Insurance Rate Maps adopted under Sec. 21A-1.5 through the city's GIS or the FEMA map service center to determine your property's flood zone designation.
What elevation must new construction meet?
Under Sec. 21A-1.8, new construction in the flood fringe must be elevated to or above base flood elevation, with specific requirements depending on the flood zone designation.
Mililani Mauka FAQ
Is my Mililani Mauka home likely in a flood zone?
Most upland lots are in Zone X, but parcels near stream corridors can fall within mapped flood zones; verify using the FEMA FIRM or ask DPP.
What if my project is near a drainage easement?
Drainage easements often carry mapped flood zones, so Chapter 21A elevation and construction standards may apply to any new construction nearby.
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