How much flood risk does Asotin County actually carry?
Asotin County lands at the 38.5th 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 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
Asotin 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 Asotin County, not just the ones FEMA mandates, 0.1% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
How Asotin County compares nationally
Asotin County sits at rank 1996 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 1697 of 3144 by population (1 is biggest). Asotin County, Washington covers 636.075 square miles and counts roughly 22,523 residents.
What to do next if you own or are buying in Asotin County
Across all of Asotin County's 8,951 residential structures, 12 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 Asotin County's numbers. See the data quality guide for why Asotin County, like hundreds of other counties, doesn't get a clean compliance percentage.