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Radon zones in Michigan

The EPA assigns every county in Michigan to one of three radon potential zones. 9 are in Zone 1, the highest category, home to about 12% of the state's residents.

83
Counties
9
Zone 1 counties
Predicted average above 4 pCi/L
32
Zone 2 counties
Predicted average 2-4 pCi/L
42
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across Michigan

Every county in Michigan, 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 · 9Zone 2 · 32Zone 3 · 42

Hover a county · click to open it

County by county

All 83 Michigan counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
Branch County145k10.2%18.0%45.6
Calhoun County1133k9.2%16.7%45.3
Cass County152k9.7%16.3%44.6
Hillsdale County146k10.5%17.8%50.2
Jackson County1159k8.7%15.4%45.3
Kalamazoo County1262k6.9%12.9%35.5
Lenawee County198k8.8%15.5%36.9
St. Joseph County161k9.6%17.4%43.6
Washtenaw County1366k5.4%9.8%25.9
Alcona County210k11.9%15.9%43.8
Alger County28,7579.6%16.0%24.3
Alpena County229k11.4%17.8%53.5
Antrim County224k9.0%13.4%39.7
Baraga County28,31010.6%18.6%37.8
Barry County264k8.3%14.9%35.0
Charlevoix County226k8.6%13.1%39.8
Clinton County280k7.3%12.9%27.3
Dickinson County226k9.2%15.1%37.2
Eaton County2109k7.5%13.3%36.7
Emmet County234k7.8%12.8%32.5
Genesee County2402k9.5%17.0%43.1
Gogebic County214k11.3%16.6%37.4
Houghton County238k7.6%13.1%40.3
Ingham County2285k6.5%13.0%34.6
Ionia County266k8.1%16.3%42.3
Iron County212k11.5%16.6%50.7
Kent County2661k6.4%13.0%34.0
Keweenaw County22,1729.0%11.5% -
Lapeer County289k9.0%16.1%38.1
Leelanau County223k7.8%10.6%21.8
Livingston County2197k6.8%11.9%32.2
Marquette County267k7.8%13.5%34.2
Menominee County223k10.6%16.7%40.1
Monroe County2155k8.6%15.2%40.8
Montcalm County268k9.5%18.3%46.3
Montmorency County29,67812.9%18.3%56.9
Oakland County21.3M5.9%10.8%28.2
Otsego County226k9.1%15.1%38.4
Presque Isle County213k11.9%16.3%27.0
Sanilac County240k10.7%17.9%40.9
Shiawassee County268k9.2%16.3%44.6
Allegan County3122k8.2%14.8%35.6
Arenac County315k11.4%17.8%47.3
Bay County3103k9.3%15.7%44.3
Benzie County318k9.0%13.5%35.2
Berrien County3152k9.2%15.0%39.9
Cheboygan County326k10.9%16.7%38.7
Chippewa County336k9.1%17.6%49.8
Clare County331k12.7%19.5%54.5
Crawford County314k11.6%17.6%57.6
Delta County337k10.5%16.4%42.6
Gladwin County326k11.9%18.2%59.6
Grand Traverse County396k7.4%12.8%33.7
Gratiot County341k8.8%16.6%41.1
Huron County331k10.8%16.6%40.9
Iosco County325k12.7%18.2%56.1
Isabella County364k8.2%15.8%40.9
Kalkaska County318k10.5%17.8%58.5
Lake County313k13.4%20.9%44.8
Luce County36,43510.1%18.1%48.1
Mackinac County311k11.7%17.7%36.7
Macomb County3875k8.2%15.2%39.8
Manistee County326k10.2%15.6%44.9
Mason County329k10.1%15.7%45.8
Mecosta County341k10.0%16.7%46.3
Midland County384k7.7%13.2%31.9
Missaukee County315k10.3%17.3%38.4
Muskegon County3177k9.1%17.1%45.7
Newaygo County351k10.4%18.0%47.0
Oceana County327k10.0%16.7%38.5
Ogemaw County321k12.0%18.3%58.4
Ontonagon County35,90612.4%16.3%43.0
Osceola County323k10.9%18.1%45.7
Oscoda County38,54513.5%19.4%56.6
Ottawa County3303k6.4%11.4%27.2
Roscommon County324k12.0%16.5%59.0
Saginaw County3188k9.6%16.2%34.9
Schoolcraft County38,14911.9%18.1%46.2
St. Clair County3160k9.2%16.3%44.8
Tuscola County353k10.2%17.3%40.6
Van Buren County376k9.5%16.4%39.0
Wayne County31.8M9.2%16.9%38.4
Wexford County334k10.2%17.4%41.8

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 Michigan

These 9 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