St. Clair County, MO flood risk explained
Flood hazard in St. Clair County sits at the 35.8th national percentile, below the national norm for flood hazard; driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 1.8 times a year. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
St. Clair County's flood-insurance compliance gap
FEMA hasn't published a residential structure count for St. Clair 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 St. Clair County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where St. Clair County ranks
Among the 3144 US counties FEMA scores for flood hazard, St. Clair County ranks 2083 — 1 being the highest hazard nationally — and 2420 by population among all 3144 counties covered here, where 1 is the largest. St. Clair County, Missouri is home to about 9,848 people across 674.981 square miles of land.
Your street may differ from St. Clair County's average
Across all of St. Clair County's 6,076 residential structures, 0 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
Where St. Clair County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. St. Clair 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.