Boise County, ID: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Boise County scores at the 42.9th percentile for flood hazard, rated "Relatively Low" — below the national norm for flood hazard. The hazard here is driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about once every 1 years. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Mandatory flood insurance compliance in Boise County
FEMA hasn't published a residential structure count for Boise County's mapped flood zone, so a reliable mandatory-compliance percentage can't be computed here — see the data quality guide for why this gap exists for roughly a quarter of US counties. Looking beyond the mandated zone, 0.4% of all residential structures in Boise County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Boise County against the rest of the country
Among the 3144 US counties FEMA scores for flood hazard, Boise County ranks 1857 — 1 being the highest hazard nationally — and 2526 by population among all 3144 counties covered here, where 1 is the largest. Boise County, Idaho is home to about 8,581 people across 1,899.368 square miles of land.
Your street may differ from Boise County's average
Across all of Boise County's 5,584 residential structures, 24 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
Where Boise County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Boise County's compliance figure is one of the ones affected by FEMA's incomplete denominator data — the data quality guide explains what that means and how many counties it touches.