How much flood risk does Grant County actually carry?
Grant County lands at the 77.2th percentile of FEMA's National Risk Index for flooding, "Relatively Moderate" territory — a middling flood hazard by national standards — with the hazard driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about once every 3 years. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
Who actually carries the flood insurance FEMA requires
Out of 962 homes FEMA counts inside Grant County's mapped flood zone, 170 carry the flood policy federal law requires there — 17.7% compliance, short of full coverage. Across all residential structures in Grant County, not just the ones FEMA mandates, 0.5% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
How Grant County compares nationally
Grant County sits at rank 748 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 598 of 3144 by population (1 is biggest). About 104,717 people live in Grant County, Washington, spread over 2,679.554 square miles.
Checking a specific address in Grant County
Across all of Grant County's 35,686 residential structures, 182 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Grant County's numbers. The guide to what the Special Flood Hazard Area actually means explains why the mandatory-insurance rule exists and who it applies to.