Bon Homme County, SD: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Bon Homme County scores at the 8.9th percentile for flood hazard, rated "Very Low" — among the lowest flood hazard in the country. 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 2.4 times a year. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Bon Homme County's flood-insurance compliance gap
FEMA hasn't published a residential structure count for Bon Homme 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% of all residential structures in Bon Homme County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Bon Homme County against the rest of the country
Among the 3144 US counties FEMA scores for flood hazard, Bon Homme County ranks 2879 — 1 being the highest hazard nationally — and 2655 by population among all 3144 counties covered here, where 1 is the largest. Bon Homme County, South Dakota is home to about 7,071 people across 563.549 square miles of land.
What to do next if you own or are buying in Bon Homme County
Across all of Bon Homme County's 4,539 residential structures, 1 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
Where Bon Homme County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Bon Homme 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.