Minnesota Radon Levels
68Zone 1 (High)
19Zone 2 (Moderate)
0Zone 3 (Low)
78% of counties in Minnesota are classified as EPA Zone 1 (highest radon potential), meaning predicted average indoor radon levels exceed 4 pCi/L — the EPA action level. The EPA recommends that all homes be tested for radon, regardless of zone classification.
| County | EPA Zone | Risk Level |
|---|---|---|
| Aitkin County | Zone 2 | Moderate Potential |
| Anoka County | Zone 2 | Moderate Potential |
| Becker County | Zone 1 | Highest Potential |
| Beltrami County | Zone 2 | Moderate Potential |
| Benton County | Zone 2 | Moderate Potential |
| Big Stone County | Zone 1 | Highest Potential |
| Blue Earth County | Zone 1 | Highest Potential |
| Brown County | Zone 1 | Highest Potential |
| Carlton County | Zone 2 | Moderate Potential |
| Carver County | Zone 1 | Highest Potential |
| Cass County | Zone 2 | Moderate Potential |
| Chippewa County | Zone 1 | Highest Potential |
| Chisago County | Zone 2 | Moderate Potential |
| Clay County | Zone 1 | Highest Potential |
| Clearwater County | Zone 2 | Moderate Potential |
| Cook County | Zone 2 | Moderate Potential |
| Cottonwood County | Zone 1 | Highest Potential |
| Crow Wing County | Zone 2 | Moderate Potential |
| Dakota County | Zone 1 | Highest Potential |
| Dodge County | Zone 1 | Highest Potential |
| Douglas County | Zone 1 | Highest Potential |
| Faribault County | Zone 1 | Highest Potential |
| Fillmore County | Zone 1 | Highest Potential |
| Freeborn County | Zone 1 | Highest Potential |
| Goodhue County | Zone 1 | Highest Potential |
| Grant County | Zone 1 | Highest Potential |
| Hennepin County | Zone 1 | Highest Potential |
| Houston County | Zone 1 | Highest Potential |
| Hubbard County | Zone 1 | Highest Potential |
| Isanti County | Zone 2 | Moderate Potential |
| Itasca County | Zone 2 | Moderate Potential |
| Jackson County | Zone 1 | Highest Potential |
| Kanabec County | Zone 1 | Highest Potential |
| Kandiyohi County | Zone 1 | Highest Potential |
| Kittson County | Zone 1 | Highest Potential |
| Koochiching County | Zone 2 | Moderate Potential |
| Lac qui Parle County | Zone 1 | Highest Potential |
| Lake County | Zone 2 | Moderate Potential |
| Lake of the Woods County | Zone 2 | Moderate Potential |
| Le Sueur County | Zone 1 | Highest Potential |
| Lincoln County | Zone 1 | Highest Potential |
| Lyon County | Zone 1 | Highest Potential |
| McLeod County | Zone 1 | Highest Potential |
| Mahnomen County | Zone 1 | Highest Potential |
| Marshall County | Zone 1 | Highest Potential |
| Martin County | Zone 1 | Highest Potential |
| Meeker County | Zone 1 | Highest Potential |
| Mille Lacs County | Zone 2 | Moderate Potential |
| Morrison County | Zone 2 | Moderate Potential |
| Mower County | Zone 1 | Highest Potential |
| Murray County | Zone 1 | Highest Potential |
| Nicollet County | Zone 1 | Highest Potential |
| Nobles County | Zone 1 | Highest Potential |
| Norman County | Zone 1 | Highest Potential |
| Olmsted County | Zone 1 | Highest Potential |
| Otter Tail County | Zone 1 | Highest Potential |
| Pennington County | Zone 1 | Highest Potential |
| Pine County | Zone 2 | Moderate Potential |
| Pipestone County | Zone 1 | Highest Potential |
| Polk County | Zone 1 | Highest Potential |
| Pope County | Zone 1 | Highest Potential |
| Ramsey County | Zone 1 | Highest Potential |
| Red Lake County | Zone 1 | Highest Potential |
| Redwood County | Zone 1 | Highest Potential |
| Renville County | Zone 1 | Highest Potential |
| Rice County | Zone 1 | Highest Potential |
| Rock County | Zone 1 | Highest Potential |
| Roseau County | Zone 1 | Highest Potential |
| St. Louis County | Zone 2 | Moderate Potential |
| Scott County | Zone 1 | Highest Potential |
| Sherburne County | Zone 1 | Highest Potential |
| Sibley County | Zone 1 | Highest Potential |
| Stearns County | Zone 1 | Highest Potential |
| Steele County | Zone 1 | Highest Potential |
| Stevens County | Zone 1 | Highest Potential |
| Swift County | Zone 1 | Highest Potential |
| Todd County | Zone 1 | Highest Potential |
| Traverse County | Zone 1 | Highest Potential |
| Wabasha County | Zone 1 | Highest Potential |
| Wadena County | Zone 1 | Highest Potential |
| Waseca County | Zone 1 | Highest Potential |
| Washington County | Zone 1 | Highest Potential |
| Watonwan County | Zone 1 | Highest Potential |
| Wilkin County | Zone 1 | Highest Potential |
| Winona County | Zone 1 | Highest Potential |
| Wright County | Zone 1 | Highest Potential |
| Yellow Medicine County | Zone 1 | Highest Potential |