How much flood risk does Nez Perce County actually carry?
Nez Perce County lands at the 57.7th percentile of FEMA's National Risk Index for flooding, "Relatively Low" territory — below the national norm for flood hazard — 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 2 years. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Who actually carries the flood insurance FEMA requires
Nez Perce County is one of the counties where FEMA's own denominator for mandated flood-zone structures is missing, so no compliance rate is shown rather than a guessed one — the data quality guide covers how common this is. Across all residential structures in Nez Perce County, not just the ones FEMA mandates, 0.2% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Nez Perce County ranks
Nez Perce County sits at rank 1393 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 1136 of 3144 by population (1 is biggest). About 42,847 people live in Nez Perce County, Idaho, spread over 848.32 square miles.
Your street may differ from Nez Perce County's average
27 of Nez Perce County's 16,403 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Nez Perce County's numbers. See the data quality guide for why Nez Perce County, like hundreds of other counties, doesn't get a clean compliance percentage.