Wisconsin earthquake risk
Milwaukee County has the highest earthquake risk in Wisconsin, scoring 80.8 out of 100 — rated "Relatively Low" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Milwaukee County | 80.8 | Relatively Low |
| 2 | Dane County | 70.7 | Relatively Low |
| 3 | Kenosha County | 61.5 | Relatively Low |
| 4 | Racine County | 61.4 | Relatively Low |
| 5 | Rock County | 59.3 | Very Low |
| 6 | Waukesha County | 57.4 | Very Low |
| 7 | Walworth County | 52.1 | Very Low |
| 8 | Jefferson County | 43.4 | Very Low |
| 9 | Dodge County | 36.9 | Very Low |
| 10 | Brown County | 35.3 | Very Low |
| 11 | Fond du Lac County | 35 | Very Low |
| 12 | Winnebago County | 33 | Very Low |
| 13 | Washington County | 32.5 | Very Low |
| 14 | Sheboygan County | 30.7 | Very Low |
| 15 | Grant County | 29.8 | Very Low |
| 16 | Outagamie County | 29.4 | Very Low |
| 17 | Green County | 29 | Very Low |
| 18 | Columbia County | 28.7 | Very Low |
| 19 | Ozaukee County | 26.4 | Very Low |
| 20 | Manitowoc County | 25.3 | Very Low |
| 21 | Sauk County | 25.3 | Very Low |
| 22 | Green Lake County | 24 | Very Low |
| 23 | La Crosse County | 22.8 | Very Low |
| 24 | Wood County | 21.4 | Very Low |
| 25 | Adams County | 21.2 | Very Low |
| 26 | Lafayette County | 21 | Very Low |
| 27 | Juneau County | 20.3 | Very Low |
| 28 | Crawford County | 19.9 | Very Low |
| 29 | Iowa County | 19.3 | Very Low |
| 30 | Waupaca County | 19.3 | Very Low |
| 31 | Marathon County | 18 | Very Low |
| 32 | Monroe County | 17.6 | Very Low |
| 33 | Portage County | 17 | Very Low |
| 34 | Calumet County | 15.4 | Very Low |
| 35 | Clark County | 14.1 | Very Low |
| 36 | Marquette County | 13.4 | Very Low |
| 37 | Vernon County | 13.2 | Very Low |
| 38 | Shawano County | 13.1 | Very Low |
| 39 | Waushara County | 13.1 | Very Low |
| 40 | Oconto County | 13 | Very Low |
| 41 | Door County | 12.8 | Very Low |
| 42 | Kewaunee County | 12.6 | Very Low |
| 43 | Richland County | 12.1 | Very Low |
| 44 | Marinette County | 11.9 | Very Low |
| 45 | Chippewa County | 10.3 | Very Low |
| 46 | Eau Claire County | 9.8 | Very Low |
| 47 | Langlade County | 8.5 | Very Low |
| 48 | Barron County | 7.4 | Very Low |
| 49 | St. Croix County | 7.1 | Very Low |
| 50 | Jackson County | 6.4 | Very Low |
| 51 | Polk County | 5.5 | Very Low |
| 52 | Trempealeau County | 5.5 | Very Low |
| 53 | Oneida County | 5.2 | Very Low |
| 54 | Dunn County | 4.6 | Very Low |
| 55 | Lincoln County | 4.3 | Very Low |
| 56 | Taylor County | 4.1 | Very Low |
| 57 | Pierce County | 3.3 | Very Low |
| 58 | Burnett County | 3.2 | Very Low |
| 59 | Vilas County | 2.7 | Very Low |
| 60 | Douglas County | 2.5 | Very Low |
| 61 | Rusk County | 2.5 | Very Low |
| 62 | Price County | 2.4 | Very Low |
| 63 | Buffalo County | 1.9 | Very Low |
| 64 | Forest County | 1.6 | Very Low |
| 65 | Menominee County | 1.2 | Very Low |
| 66 | Pepin County | 1.1 | Very Low |
| 67 | Washburn County | 1 | Very Low |
| 68 | Sawyer County | 0.8 | Very Low |
| 69 | Florence County | 0.5 | Very Low |
| 70 | Ashland County | 0.3 | Very Low |
| 71 | Iron County | 0.3 | Very Low |
| 72 | Bayfield County | 0 | No Rating |
Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.
Earthquake risk nationally:
Other hazard risks in Wisconsin:
Frequently asked questions
What is the highest earthquake risk county in Wisconsin?
Milwaukee County, WI has the highest earthquake risk in Wisconsin, with a FEMA National Risk Index score of 80.8 out of 100 (rated "Relatively Low").
What causes earthquake risk in Wisconsin?
Earthquake risk reflects expected annual losses from ground shaking. High scores concentrate in California, the Pacific Northwest, Alaska, and the New Madrid Seismic Zone (spanning Missouri, Arkansas, Tennessee, and neighboring states). NOAA's Storm Events Database does not track earthquakes, so recorded event counts are not shown.