Is radon high in Michigan?

Michigan's population-weighted predicted basement average is 1.6 pCi/L, close to the US average of 1.8. 0 of its 83 modeled counties are predicted at or above the EPA action level of 4 pCi/L, 17 are in the 2-4 "consider fixing" range and 66 are below 2. 0% of Michigan ZIP codes are predicted at 4 or higher.

Which Michigan county has the highest radon?

Branch County has the highest predicted basement average in Michigan at 3.5 pCi/L (EPA Zone 1). The lowest is Midland County at 0.9 pCi/L. These are modeled area averages; individual homes in any county can test far higher.

How many EPA Zone 1 counties are in Michigan?

9 of Michigan's 83 counties (11%) are EPA Zone 1 (highest potential), 32 are Zone 2 and 42 are Zone 3. The EPA zone map dates from 1993; the predicted values on this page come from a 2001-2021 model built on millions of actual tests, so the two can disagree for a given county.

Should I test for radon in Michigan?

Yes. Even though Michigan's predicted average is below 2 pCi/L, the EPA recommends every home be tested - radon varies house to house, and 24.5% of Michigan ZIP codes are still predicted at 2 pCi/L or higher.

Radon levels in Michigan: Low

The model predicts a population-weighted basement average of 1.6 pCi/L across Michigan's 83 counties - close to the US average of 1.8 pCi/L. Above-ground floors average 1.0 pCi/L.

Predicted (model estimate). The pCi/L figures on this page are long-term area averages from a peer-reviewed national model built on millions of real radon tests (2001-2021). They describe the typical home in this area - not your home, which can be several times higher or lower. The EPA radon zone is a separate, 1993 county-level classification. How the numbers work.

9 / 83

EPA Zone 1 counties (11%)

32 / 42

Zone 2 / Zone 3 counties

counties predicted ≥ 4 pCi/L

of ZIP codes predicted ≥ 4 pCi/L

Michigan counties by predicted radon

Sorted highest to lowest predicted basement average. 83 counties.

County	Predicted basement	Upstairs	Grade	EPA zone	ZIPs
Branch County	3.5 pCi/L	2.2	Moderate	EPA Zone 1	6
Hillsdale County	3.4 pCi/L	2.0	Moderate	EPA Zone 1	12
Lenawee County	3.0 pCi/L	1.9	Moderate	EPA Zone 1	17
Jackson County	2.9 pCi/L	1.9	Moderate	EPA Zone 1	17
Otsego County	2.6 pCi/L	1.1	Moderate	EPA Zone 2	3
St. Joseph County	2.6 pCi/L	1.9	Moderate	EPA Zone 1	9
Calhoun County	2.4 pCi/L	1.7	Moderate	EPA Zone 1	12
Cass County	2.3 pCi/L	1.4	Moderate	EPA Zone 1	7
Dickinson County	2.3 pCi/L	1.1	Moderate	EPA Zone 2	9
Kalamazoo County	2.2 pCi/L	1.5	Moderate	EPA Zone 1	17
Barry County	2.2 pCi/L	1.3	Moderate	EPA Zone 2	8
Iron County	2.2 pCi/L	1.2	Moderate	EPA Zone 2	3
Ionia County	2.1 pCi/L	1.2	Moderate	EPA Zone 2	11
Lapeer County	2.1 pCi/L	1.1	Moderate	EPA Zone 2	11
Shiawassee County	2.0 pCi/L	1.2	Moderate	EPA Zone 2	12
Livingston County	2.0 pCi/L	1.4	Moderate	EPA Zone 2	10
Eaton County	2.0 pCi/L	1.3	Moderate	EPA Zone 2	11
Washtenaw County	2.0 pCi/L	1.4	Low	EPA Zone 1	12
Clinton County	2.0 pCi/L	1.1	Low	EPA Zone 2	10
Tuscola County	2.0 pCi/L	0.9	Low	EPA Zone 3	13
Montcalm County	1.9 pCi/L	1.1	Low	EPA Zone 2	15
Sanilac County	1.9 pCi/L	1.1	Low	EPA Zone 2	16
Kalkaska County	1.9 pCi/L	1.0	Low	EPA Zone 3	4
Monroe County	1.9 pCi/L	1.1	Low	EPA Zone 2	16
Mecosta County	1.8 pCi/L	1.1	Low	EPA Zone 3	7
Montmorency County	1.8 pCi/L	1.0	Low	EPA Zone 2	2
Alcona County	1.8 pCi/L	0.9	Low	EPA Zone 2	10
Berrien County	1.8 pCi/L	0.9	Low	EPA Zone 3	19
Ogemaw County	1.8 pCi/L	1.0	Low	EPA Zone 3	5
Marquette County	1.8 pCi/L	1.1	Low	EPA Zone 2	10
Grand Traverse County	1.7 pCi/L	1.0	Low	EPA Zone 3	4
Oscoda County	1.7 pCi/L	0.9	Low	EPA Zone 3	5
Missaukee County	1.7 pCi/L	0.9	Low	EPA Zone 3	4
Presque Isle County	1.7 pCi/L	1.0	Low	EPA Zone 2	6
Van Buren County	1.7 pCi/L	0.9	Low	EPA Zone 3	12
Crawford County	1.7 pCi/L	1.0	Low	EPA Zone 3	2
Roscommon County	1.7 pCi/L	0.8	Low	EPA Zone 3	4
Benzie County	1.7 pCi/L	0.9	Low	EPA Zone 3	7
Osceola County	1.7 pCi/L	1.0	Low	EPA Zone 3	7
Charlevoix County	1.7 pCi/L	1.0	Low	EPA Zone 2	4
Clare County	1.7 pCi/L	1.0	Low	EPA Zone 3	4
Oakland County	1.6 pCi/L	1.2	Low	EPA Zone 2	68
Manistee County	1.6 pCi/L	0.9	Low	EPA Zone 3	8
Antrim County	1.6 pCi/L	0.9	Low	EPA Zone 2	9
Genesee County	1.6 pCi/L	0.9	Low	EPA Zone 2	22
Wexford County	1.6 pCi/L	0.9	Low	EPA Zone 3	5
Leelanau County	1.6 pCi/L	0.9	Low	EPA Zone 2	6
Huron County	1.5 pCi/L	0.8	Low	EPA Zone 3	13
Ingham County	1.5 pCi/L	1.1	Low	EPA Zone 2	16
Allegan County	1.5 pCi/L	0.9	Low	EPA Zone 3	14
Isabella County	1.5 pCi/L	0.8	Low	EPA Zone 3	5
Lake County	1.5 pCi/L	0.9	Low	EPA Zone 3	6
Oceana County	1.5 pCi/L	0.9	Low	EPA Zone 3	8
St. Clair County	1.5 pCi/L	0.9	Low	EPA Zone 3	21
Emmet County	1.5 pCi/L	1.0	Low	EPA Zone 2	8
Keweenaw County	1.5 pCi/L	1.1	Low	EPA Zone 2	1
Gratiot County	1.5 pCi/L	0.8	Low	EPA Zone 3	12
Kent County	1.5 pCi/L	0.9	Low	EPA Zone 2	27
Newaygo County	1.5 pCi/L	0.9	Low	EPA Zone 3	6
Gogebic County	1.5 pCi/L	1.0	Low	EPA Zone 2	5
Saginaw County	1.4 pCi/L	0.6	Low	EPA Zone 3	18
Delta County	1.4 pCi/L	0.8	Low	EPA Zone 3	8
Gladwin County	1.4 pCi/L	0.8	Low	EPA Zone 3	4
Iosco County	1.4 pCi/L	0.8	Low	EPA Zone 3	7
Luce County	1.4 pCi/L	0.7	Low	EPA Zone 3	2
Alger County	1.4 pCi/L	0.8	Low	EPA Zone 2	9
Mackinac County	1.4 pCi/L	0.8	Low	EPA Zone 3	10
Macomb County	1.4 pCi/L	0.8	Low	EPA Zone 3	36
Arenac County	1.3 pCi/L	0.7	Low	EPA Zone 3	6
Baraga County	1.3 pCi/L	0.8	Low	EPA Zone 2	6
Cheboygan County	1.3 pCi/L	0.8	Low	EPA Zone 3	4
Menominee County	1.3 pCi/L	0.9	Low	EPA Zone 2	11
Ottawa County	1.3 pCi/L	0.8	Low	EPA Zone 3	13
Chippewa County	1.3 pCi/L	0.7	Low	EPA Zone 3	13
Ontonagon County	1.2 pCi/L	0.7	Low	EPA Zone 3	5
Wayne County	1.2 pCi/L	0.8	Low	EPA Zone 3	66
Bay County	1.2 pCi/L	0.6	Low	EPA Zone 3	9
Schoolcraft County	1.2 pCi/L	0.6	Low	EPA Zone 3	4
Mason County	1.1 pCi/L	0.7	Low	EPA Zone 3	5
Houghton County	1.1 pCi/L	0.8	Low	EPA Zone 2	12
Muskegon County	1.1 pCi/L	0.7	Low	EPA Zone 3	13
Alpena County	1.0 pCi/L	0.7	Low	EPA Zone 2	4
Midland County	0.9 pCi/L	0.6	Low	EPA Zone 3	5

Michigan radon questions

Is radon high in Michigan?: Michigan's population-weighted predicted basement average is 1.6 pCi/L, close to the US average of 1.8. 0 of its 83 modeled counties are predicted at or above the EPA action level of 4 pCi/L, 17 are in the 2-4 "consider fixing" range and 66 are below 2. 0% of Michigan ZIP codes are predicted at 4 or higher.
Which Michigan county has the highest radon?: Branch County has the highest predicted basement average in Michigan at 3.5 pCi/L (EPA Zone 1). The lowest is Midland County at 0.9 pCi/L. These are modeled area averages; individual homes in any county can test far higher.
How many EPA Zone 1 counties are in Michigan?: 9 of Michigan's 83 counties (11%) are EPA Zone 1 (highest potential), 32 are Zone 2 and 42 are Zone 3. The EPA zone map dates from 1993; the predicted values on this page come from a 2001-2021 model built on millions of actual tests, so the two can disagree for a given county.
Should I test for radon in Michigan?: Yes. Even though Michigan's predicted average is below 2 pCi/L, the EPA recommends every home be tested - radon varies house to house, and 24.5% of Michigan ZIP codes are still predicted at 2 pCi/L or higher.

Michigan radon program

Many states offer free or discounted test kits and keep lists of certified mitigators. Find the Michigan radon office through the EPA state radon contacts page. Then read how to test and what mitigation costs.