Green Lake County, WI: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Green Lake County scores at the 62.3th 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 2 years. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Mandatory flood insurance compliance in Green Lake County
Out of 202 homes FEMA counts inside Green Lake County's mapped flood zone, 21 carry the flood policy federal law requires there — 10.4% compliance, short of full coverage. Looking beyond the mandated zone, 0.4% of all residential structures in Green Lake County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Green Lake County ranks
Among the 3144 US counties FEMA scores for flood hazard, Green Lake County ranks 1238 — 1 being the highest hazard nationally — and 1866 by population among all 3144 counties covered here, where 1 is the largest. Green Lake County, Wisconsin is home to about 19,370 people across 349.541 square miles of land.
What to do next if you own or are buying in Green Lake County
36 of Green Lake County's 9,303 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
Where Green Lake County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. If you're unsure why any of this insurance requirement exists at all, the SFHA explainer covers it from first principles.