Flood Zones: Kailua vs Mililani Mauka
How do flood zones rules compare between Kailua, HI and Mililani Mauka, HI?
Mililani Mauka has fewer restrictions than Kailua.
Kailua, HI
Honolulu County
Much of low-lying Kailua sits in FEMA-mapped flood zones, and ROH Chapter 21A sets elevation, foundation, and variance standards for development in these areas.
View full Kailua 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 | Kailua | Mililani Mauka |
|---|---|---|
| - | - |
Highlighted rows indicate differences between cities.
Kailua FAQ
Do I need flood insurance in Kailua?
Many Kailua properties are in flood zones where federally backed mortgages require flood insurance; check the FEMA map for your parcel.
Can I finish a ground floor below base flood elevation?
Only limited, flood-resistant uses are allowed below base flood elevation; habitable finishes generally are not permitted without a variance.
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.
Compare other topics
See how Kailua and Mililani Mauka compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool