How much flood risk does Monona County actually carry?
Monona County lands at the 25th percentile of FEMA's National Risk Index for flooding, "Very Low" territory — among the lowest flood hazard in the country — 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.
Monona County's flood-insurance compliance gap
Monona 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 Monona County, not just the ones FEMA mandates, 0.6% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Monona County against the rest of the country
Monona County sits at rank 2402 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 2543 of 3144 by population (1 is biggest). Monona County, Iowa is home to about 8,429 people across 694.072 square miles of land.
What to do next if you own or are buying in Monona County
29 of Monona County's 4,740 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Monona County's numbers. See the data quality guide for why Monona County, like hundreds of other counties, doesn't get a clean compliance percentage.