FEMA NFHL (Flood Zones)
The National Flood Hazard Layer (NFHL) is FEMA's official flood-zone mapping. It's the data behind the Flood Insurance Rate Maps (FIRMs) that determine a parcel's flood zone — and, with it, mandatory-insurance and lender requirements.
Flood zones fall into broad families: high-risk Special Flood Hazard Areas (the A and V zones, where flood insurance is generally mandatory for a federally backed mortgage), the coastal high-hazard V zones with wave action, moderate/minimal-risk X zones, and areas of undetermined risk. A parcel's zone, and its base flood elevation, drive both insurance cost and design.
FIRMs are updated over time, and a map change can move a parcel into or out of a mandatory-insurance zone — so the effective map, not an old one, is what governs.
A parcel's FEMA flood zone is a first-order cost and design input — it can mean mandatory flood insurance, elevation requirements, and lender conditions. Reading it from the current NFHL is basic diligence on any Hawaiʻi parcel near water.
The National Flood Hazard Layer — FEMA's official digital flood-zone mapping, the source behind the Flood Insurance Rate Maps that set a parcel's flood zone and insurance requirements.
The high-risk Special Flood Hazard Areas — the A and V zones — generally require flood insurance for a federally backed mortgage. X zones are moderate-to-minimal risk and are not subject to the mandatory-purchase requirement.
This is a plain-language reference, not legal advice. KILO is a pre-development screening tool, not a system of record — confirm any determination with the agency of jurisdiction.