How much flood risk does Eau Claire County actually carry?
Eau Claire County lands at the 79.9th percentile of FEMA's National Risk Index for flooding, "Relatively Moderate" territory — a middling flood hazard by national standards — 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. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Mandatory flood insurance compliance in Eau Claire County
Homes with a federally backed mortgage inside Eau Claire County's mapped high-risk flood zone (the Special Flood Hazard Area, or SFHA) are legally required to carry an NFIP flood policy. In practice, 9.5% of them do — 60 active policies against 632 structures FEMA counts in that zone, leaving a real compliance gap. Across all residential structures in Eau Claire County, not just the ones FEMA mandates, 0.3% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Eau Claire County ranks
Eau Claire County sits at rank 660 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 581 of 3144 by population (1 is biggest). Eau Claire County, Wisconsin covers 637.922 square miles and counts roughly 108,830 residents.
Checking a specific address in Eau Claire County
FEMA counts 34,916 residential structures in Eau Claire County overall, 87 of them carrying some form of NFIP coverage — but a lender or insurer cares about one parcel, not that county total.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Eau Claire County's numbers. The guide to what the Special Flood Hazard Area actually means explains why the mandatory-insurance rule exists and who it applies to.