How it works
From address to answer, in four steps.
No guesswork and no black box. Every number on a report comes from a named public source.
Find the exact spot
Type an address or drop a pin. The pin matters: flood zones can change across a single street.
Ask the official sources
We query FEMA's flood map, USGS elevation data and OpenFEMA claims and disaster records live.
Translate it
We convert datums when needed, compare ground to the flood level and explain each result in plain English.
Share and act
Get a report with a share link and PDF layout, plus clear next steps.
Where the numbers come from.
Full details and licences are on our data sources page.
FEMA National Flood Hazard Layer
Flood zones, base flood elevations, map panels and map amendments.
USGS 3DEP
Ground elevation at the point you picked.
NOAA VDatum
Converts older NGVD29 flood maps to NAVD88 so elevations compare fairly.
OpenFEMA
NFIP claims by ZIP code since 1978 and disaster declarations since 2000.
What a report is, and isn't.
A report is fast, honest context. It is not an official flood zone determination, an elevation certificate or an insurance quote. For those, we tell you exactly who to ask.