The flood zone,
straight off the FEMA map.

Paste the address into the Native Base flood zone lookup. It geocodes the address with the US Census geocoder, then reads FEMA’s National Flood Hazard Layer at that exact point and returns the flood zone, the Special Flood Hazard Area flag, the base flood elevation where FEMA publishes one, and the FIRM panel number with its effective date. Each result links to the official FEMA Map Service Center page for the same address.

Zone X is minimal flood hazard (outside the mapped floodplains); shaded Zone X is moderate hazard — the 0.2% annual chance ("500-year") band. Zones A, AE, AH, AO, AR and A99 are Special Flood Hazard Areas with a 1% annual chance of flooding (the "100-year" floodplain), where federally-backed lenders typically require flood insurance. Zones V and VE are coastal high hazard areas with wave action. Zone D means flood risk is undetermined — no study has been performed.

If the building secures a federally-backed mortgage, lenders are required to make borrowers carry flood insurance in any Special Flood Hazard Area (zones starting with A or V). Without a mortgage there is no legal requirement, but the 1% annual chance designation is FEMA’s own risk statement. For commercial submissions, an SFHA determination usually means an NFIP or private flood quote belongs in the package.

No. Lenders use a paid Standard Flood Hazard Determination Form (SFHDF) from a flood determination vendor, which certifies the finding and carries liability. This tool reads the same public FEMA National Flood Hazard Layer those vendors use — it is the fast, free first check for quoting and prospecting, and every result links to the official FEMA map for verification.

FEMA has not published a flood study for every part of the country. If the National Flood Hazard Layer has no polygon at the point, the address is unmapped — which is not the same as minimal risk. Zone D (undetermined) areas and unmapped areas both deserve a closer look before assuming the exposure away.