Radon and home risks by county
Radon in Minnesota
68 of Minnesota's 87 counties are in EPA's highest radon zone, home to about 81% of the state's residents. Radon zones describe an area's potential; EPA recommends testing every home regardless of zone.
Zone 1 counties
68
high radon potential
Zone 2 counties
19
moderate potential
Zone 3 counties
0
low potential
Counties with water violations
50
since 2016; 9 with unresolved ones
Find your county by ZIP
Zone 1: high potential (68 counties)
| County | Residents | Water systems | Health violations since 2016 | Unresolved |
|---|---|---|---|---|
| Becker County | 35,444 | 10 | 17 | 0 |
| Big Stone County | 5,067 | 9 | 0 | 0 |
| Blue Earth County | 70,700 | 17 | 13 | 0 |
| Brown County | 25,710 | 7 | 0 | 0 |
| Carver County | 112,628 | 12 | 1 | 0 |
| Chippewa County | 12,299 | 5 | 0 | 0 |
| Clay County | 66,848 | 13 | 2 | 0 |
| Cottonwood County | 11,338 | 9 | 0 | 0 |
| Dakota County | 453,156 | 20 | 55 | 0 |
| Dodge County | 21,242 | 6 | 0 | 0 |
| Douglas County | 39,933 | 11 | 12 | 0 |
| Faribault County | 13,886 | 12 | 3 | 0 |
| Fillmore County | 21,502 | 14 | 0 | 0 |
| Freeborn County | 30,314 | 16 | 30 | 0 |
| Goodhue County | 47,982 | 12 | 7 | 0 |
| Grant County | 6,109 | 7 | 6 | 0 |
| Hennepin County | 1,273,334 | 44 | 2 | 0 |
| Houston County | 18,352 | 6 | 0 | 0 |
| Hubbard County | 22,050 | 7 | 1 | 0 |
| Jackson County | 9,861 | 6 | 1 | 1 |
| Kanabec County | 16,608 | 3 | 0 | 0 |
| Kandiyohi County | 44,674 | 15 | 20 | 0 |
| Kittson County | 3,992 | 6 | 0 | 0 |
| Lac qui Parle County | 6,636 | 6 | 0 | 0 |
| Le Sueur County | 29,458 | 11 | 7 | 0 |
| Lincoln County | 5,564 | 7 | 0 | 0 |
| Lyon County | 25,577 | 12 | 0 | 0 |
| Mahnomen County | 5,296 | 3 | 0 | 0 |
| Marshall County | 8,771 | 12 | 1 | 1 |
| Martin County | 19,561 | 9 | 7 | 0 |
| McLeod County | 36,780 | 10 | 6 | 0 |
| Meeker County | 23,491 | 7 | 4 | 0 |
| Mower County | 40,900 | 17 | 2 | 0 |
| Murray County | 8,044 | 9 | 0 | 0 |
| Nicollet County | 34,493 | 6 | 7 | 0 |
| Nobles County | 21,969 | 12 | 5 | 1 |
| Norman County | 6,284 | 9 | 1 | 1 |
| Olmsted County | 166,424 | 18 | 0 | 0 |
| Otter Tail County | 60,884 | 16 | 37 | 0 |
| Pennington County | 13,652 | 6 | 8 | 0 |
| Pipestone County | 9,100 | 10 | 0 | 0 |
| Polk County | 30,413 | 11 | 19 | 0 |
| Pope County | 11,495 | 6 | 0 | 0 |
| Ramsey County | 542,015 | 18 | 1 | 0 |
| Red Lake County | 3,882 | 3 | 0 | 0 |
| Redwood County | 15,254 | 14 | 0 | 0 |
| Renville County | 14,453 | 10 | 3 | 0 |
| Rice County | 69,025 | 14 | 19 | 2 |
| Rock County | 9,525 | 8 | 0 | 0 |
| Roseau County | 15,265 | 13 | 22 | 1 |
| Scott County | 157,206 | 17 | 4 | 0 |
| Sherburne County | 103,059 | 9 | 0 | 0 |
| Sibley County | 15,194 | 8 | 16 | 0 |
| Stearns County | 163,997 | 33 | 3 | 0 |
| Steele County | 37,434 | 7 | 12 | 0 |
| Stevens County | 9,819 | 5 | 0 | 0 |
| Swift County | 9,666 | 6 | 0 | 0 |
| Todd County | 25,955 | 8 | 0 | 0 |
| Traverse County | 3,134 | 4 | 2 | 2 |
| Wabasha County | 21,574 | 10 | 0 | 0 |
| Wadena County | 14,437 | 4 | 1 | 0 |
| Waseca County | 18,684 | 4 | 4 | 0 |
| Washington County | 283,960 | 29 | 0 | 0 |
| Watonwan County | 11,204 | 8 | 2 | 0 |
| Wilkin County | 6,268 | 5 | 0 | 0 |
| Winona County | 49,973 | 12 | 12 | 0 |
| Wright County | 154,593 | 18 | 3 | 0 |
| Yellow Medicine County | 9,373 | 9 | 1 | 0 |
Zone 2: moderate potential (19 counties)
| County | Residents | Water systems | Health violations since 2016 | Unresolved |
|---|---|---|---|---|
| Aitkin County | 16,335 | 6 | 3 | 1 |
| Anoka County | 376,840 | 30 | 7 | 0 |
| Beltrami County | 46,762 | 18 | 1 | 0 |
| Benton County | 41,881 | 8 | 0 | 0 |
| Carlton County | 36,745 | 12 | 0 | 0 |
| Cass County | 31,442 | 13 | 0 | 0 |
| Chisago County | 59,105 | 18 | 20 | 0 |
| Clearwater County | 8,630 | 3 | 0 | 0 |
| Cook County | 5,571 | 2 | 0 | 0 |
| Crow Wing County | 68,642 | 23 | 6 | 0 |
| Isanti County | 43,687 | 5 | 0 | 0 |
| Itasca County | 45,442 | 18 | 1 | 0 |
| Koochiching County | 11,594 | 5 | 0 | 0 |
| Lake County | 10,698 | 3 | 0 | 0 |
| Lake of the Woods County | 3,797 | 2 | 0 | 0 |
| Mille Lacs County | 27,577 | 9 | 0 | 0 |
| Morrison County | 34,520 | 9 | 1 | 1 |
| Pine County | 30,319 | 15 | 10 | 0 |
| St. Louis County | 200,794 | 30 | 11 | 0 |
How to read this table
Water systems counts community systems that list the county in their service area; one system can serve several counties. Health violations are breaches of a legal limit or treatment rule recorded by EPA since January 2016, not paperwork lapses. A violation stays unresolved until the state records it as fixed.
Other states
- Arizona
- California
- Colorado
- Florida
- Idaho
- Illinois
- Iowa
- Michigan
- New Jersey
- New York
- Ohio
- Pennsylvania
- Texas
- Utah
Sources: EPA Map of Radon Zones, EPA ECHO Safe Drinking Water Act data (2026Q3, published October 2026), US Census Bureau Vintage 2024 estimates. See the methodology.