riskbycounty
FEMA NRI v1.20Released December 2025Methodology

Wisconsin Disaster Risk

Natural disaster risk data for all 72 counties.

FEMA release

December 2025

Mean county NRI score

59.1

Counties with Data

72

of 72 total

County risk atlas

Wisconsin hazard exposure by county

FEMA NRI v1.20 scores on a 0–100 relative scale. Toggle the composite and five selected hazard categories out of FEMA's 18. Flood is the higher of Coastal Flooding and Inland Flooding NRI scores.

Counties

72/72

Mean county NRI score

59.1

Risk layers

6

All Wisconsin Counties

CountyNRI score
Milwaukee County98.4
Dane County93.9
Brown County90.0
Waukesha County88.9
Marathon County87.2
Winnebago County86.8
Rock County86.4
Racine County85.4
Kenosha County85.0
Columbia County81.4
La Crosse County80.5
Marinette County80.0
Outagamie County79.7
Monroe County78.8
Eau Claire County78.3
Fond du Lac County76.3
Wood County75.9
Jefferson County75.8
Vernon County75.0
Walworth County74.8
Sawyer County74.5
Sauk County72.1
Adams County70.9
Juneau County70.8
Sheboygan County70.2
Dodge County69.9
Manitowoc County68.9
Barron County68.6
Clark County68.4
Washington County68.3
Waupaca County67.6
Chippewa County67.3
St. Croix County64.1
Polk County63.3
Vilas County63.3
Shawano County63.1
Portage County62.7
Oneida County62.5
Douglas County62.4
Oconto County61.5
Grant County61.1
Trempealeau County58.7
Green Lake County58.0
Florence County54.2
Lincoln County52.6
Richland County51.6
Ozaukee County50.3
Langlade County49.6
Burnett County49.3
Dunn County48.8
Jackson County48.1
Marquette County47.6
Forest County47.4
Door County46.9
Green County46.4
Crawford County46.2
Waushara County43.3
Pierce County42.3
Rusk County37.3
Taylor County37.2
Bayfield County35.1
Lafayette County33.1
Washburn County32.8
Price County32.3
Ashland County31.7
Calumet County30.2
Iowa County23.4
Kewaunee County17.3
Buffalo County14.5
Iron County11.5
Menominee County9.1
Pepin County7.2

Frequently Asked Questions

How many Wisconsin county records are included?
RiskByCounty includes 72 Wisconsin county records from FEMA NRI v1.20 (December 2025).
Which FEMA county ratings appear in Wisconsin?
FEMA NRI v1.20 (December 2025) county rating counts for Wisconsin: Very Low: 15; Relatively Low: 47; Relatively Moderate: 9; Relatively High: 1; Very High: 0; Not available: 0.
How complete are the five selected hazard fields for Wisconsin?
FEMA NRI v1.20 (December 2025) availability among 72 county records: Flood: 72 of 72; Wildfire: 72 of 72; Tornado: 72 of 72; Earthquake: 72 of 72; Hurricane: 66 of 72. RiskByCounty displays five selected hazard categories out of FEMA's 18.

Official Ready.gov resource

Continue to Ready.gov for federal emergency-planning information maintained outside RiskByCounty.

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Data Source

County data sourced from FEMA National Risk Index v1.20, released December 2025. Values are labeled NRI score (0–100 relative scale). RiskByCounty displays five selected hazard categories out of FEMA's 18; flood is the higher of the Coastal Flooding and Inland Flooding source scores.

RiskByCounty presents county-level source fields and deterministic arithmetic summaries.

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