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Radon zones in Minnesota

The EPA assigns every county in Minnesota to one of three radon potential zones. 68 are in Zone 1, the highest category, home to about 81% of the state's residents.

87
Counties
68
Zone 1 counties
Predicted average above 4 pCi/L
19
Zone 2 counties
Predicted average 2-4 pCi/L
0
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across Minnesota

Every county in Minnesota, filled by the zone the EPA assigns it. Zones follow geology rather than county lines, so the colour usually changes where the bedrock does, not where the border is.

Zone 1 · 68Zone 2 · 19Zone 3 · 0

Hover a county · click to open it

County by county

All 87 Minnesota counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
Becker County135k7.2%15.4%31.3
Big Stone County15,1057.8%15.5% -
Blue Earth County170k5.4%13.5%30.6
Brown County126k6.6%14.6%35.3
Carver County1111k4.3%11.3%19.4
Chippewa County112k7.6%16.3%37.5
Clay County166k5.2%13.7%31.1
Cottonwood County111k7.6%15.8%27.5
Dakota County1447k4.6%11.3%24.5
Dodge County121k5.1%13.5%21.4
Douglas County140k6.4%13.7%27.5
Faribault County114k7.8%16.4%37.6
Fillmore County122k6.9%15.5%29.3
Freeborn County131k7.4%16.1%35.1
Goodhue County148k6.4%14.7%34.4
Grant County16,1397.7%16.6%35.4
Hennepin County11.3M4.4%11.1%25.3
Houston County119k6.4%13.8%29.3
Hubbard County122k7.3%14.2%30.1
Jackson County19,9196.6%14.1%23.7
Kanabec County117k7.9%17.8%53.0
Kandiyohi County144k6.6%14.4%26.7
Kittson County14,0607.1%14.3%53.4
Lac qui Parle County16,6307.0%14.0%23.9
Le Sueur County129k5.8%14.3%32.5
Lincoln County15,5217.1%15.0%34.5
Lyon County125k6.2%14.7%30.9
Mahnomen County15,28010.2%24.5%77.7
Marshall County18,8107.0%15.3%23.6
Martin County120k7.5%15.6%36.1
McLeod County137k6.3%14.9%27.7
Meeker County123k6.8%15.6%37.1
Mower County140k6.7%15.8%30.6
Murray County18,0497.2%14.6%31.0
Nicollet County134k5.5%13.7%23.4
Nobles County122k7.3%16.7%32.1
Norman County16,3297.3%15.9%54.6
Olmsted County1165k4.7%11.2%26.0
Otter Tail County161k7.2%15.3%33.9
Pennington County114k6.3%15.4%33.1
Pipestone County19,2457.5%16.5%48.6
Polk County130k6.7%15.3%32.8
Pope County111k7.1%14.6%35.0
Ramsey County1536k5.2%12.5%28.6
Red Lake County13,9116.8%15.5% -
Redwood County115k7.4%16.3%29.6
Renville County114k7.5%16.6%27.1
Rice County168k5.5%13.9%30.8
Rock County19,5516.7%15.4%34.2
Roseau County115k6.8%15.6%26.2
Scott County1156k4.3%12.2%29.3
Sherburne County1102k4.9%14.2%40.4
Sibley County115k6.7%15.7%31.0
Stearns County1161k5.8%14.0%30.0
Steele County137k6.1%14.2%29.8
Stevens County19,7285.5%13.1% -
Swift County19,7197.8%16.6%33.7
Todd County126k8.3%17.8%32.5
Traverse County13,1367.7%15.9% -
Wabasha County122k6.5%13.9%33.1
Wadena County114k7.8%17.2%55.9
Waseca County119k6.5%15.4%27.4
Washington County1279k4.5%10.9%25.3
Watonwan County111k6.9%14.9%40.1
Wilkin County16,3067.3%16.6%48.8
Winona County150k5.8%13.0%35.4
Wright County1151k4.9%12.8%34.2
Yellow Medicine County19,4677.2%16.0%32.2
Aitkin County216k9.2%16.4%39.5
Anoka County2372k5.2%13.6%28.2
Beltrami County247k6.9%17.5%33.4
Benton County242k5.9%16.0%39.4
Carlton County237k6.4%16.2%43.8
Cass County231k8.2%16.9%31.6
Chisago County259k5.7%14.8%39.6
Clearwater County28,6448.0%18.8%47.0
Cook County25,6396.6%13.0% -
Crow Wing County268k6.9%14.8%32.4
Isanti County243k6.3%16.2%34.3
Itasca County245k7.5%16.0%41.2
Koochiching County212k7.7%15.9%25.2
Lake County211k7.4%15.1%32.8
Lake of the Woods County23,7787.3%15.3% -
Mille Lacs County227k7.1%17.5%34.6
Morrison County234k7.2%16.4%31.2
Pine County230k7.8%18.1%42.3
St. Louis County2201k6.5%15.2%33.9

Zones from the EPA Map of Radon Zones. COPD and smoking are CDC PLACES model-based estimates of adult prevalence. Lung cancer death rates are age-adjusted deaths per 100,000 per year, 2019-2023, from NCI State Cancer Profiles. A dash means the source does not report a value for that county.

Highest potential

Zone 1 counties in Minnesota

These 68 counties have a predicted average indoor radon screening level above the EPA action level. The EPA recommends every home in them be tested.

Other states

Radon zones elsewhere