Michigan Radon Zone Map
Counties colored by EPA radon zone. Red = Zone 1, Orange = Zone 2, Green = Zone 3.
Highest-Risk Counties
Branch57.1% above action level
Calhoun61.5% above action level
Cass41.7% above action level
Hillsdale55.6% above action level
Jackson43.3% above action level
Kalamazoo34.1% above action level
Lenawee37.5% above action level
St. JosephZone 1 — High
Washtenaw32.1% above action level
All 83 Counties — By Radon Risk
| County | EPA Zone | Tests | % Above 4 pCi/L |
|---|
| Branch |
High |
7 |
57.1% |
| Calhoun |
High |
26 |
61.5% |
| Cass |
High |
12 |
41.7% |
| Hillsdale |
High |
9 |
55.6% |
| Jackson |
High |
30 |
43.3% |
| Kalamazoo |
High |
41 |
34.1% |
| Lenawee |
High |
16 |
37.5% |
| St. Joseph |
High |
11 |
— |
| Washtenaw |
High |
56 |
32.1% |
| Alcona |
Moderate |
— |
— |
| Alger |
Moderate |
— |
— |
| Alpena |
Moderate |
6 |
66.7% |
| Antrim |
Moderate |
6 |
— |
| Baraga |
Moderate |
— |
— |
| Barry |
Moderate |
9 |
44.4% |
| Charlevoix |
Moderate |
6 |
— |
| Clinton |
Moderate |
10 |
— |
| Dickinson |
Moderate |
6 |
— |
| Eaton |
Moderate |
20 |
50% |
| Emmet |
Moderate |
9 |
— |
| Genesee |
Moderate |
78 |
33.3% |
| Gogebic |
Moderate |
— |
— |
| Houghton |
Moderate |
5 |
— |
| Ingham |
Moderate |
40 |
37.5% |
| Ionia |
Moderate |
9 |
44.4% |
| Iron |
Moderate |
— |
— |
| Kent |
Moderate |
85 |
40% |
| Keweenaw |
Moderate |
— |
— |
| Lapeer |
Moderate |
17 |
52.9% |
| Leelanau |
Moderate |
4 |
— |
| Livingston |
Moderate |
37 |
35.1% |
| Marquette |
Moderate |
9 |
— |
| Menominee |
Moderate |
5 |
— |
| Monroe |
Moderate |
25 |
64% |
| Montcalm |
Moderate |
9 |
55.6% |
| Montmorency |
Moderate |
— |
— |
| Oakland |
Moderate |
241 |
32.8% |
| Otsego |
Moderate |
— |
— |
| Presque Isle |
Moderate |
— |
— |
| Sanilac |
Moderate |
9 |
66.7% |
| Shiawassee |
Moderate |
11 |
63.6% |
| Allegan |
Low |
18 |
44.4% |
| Arenac |
Low |
— |
— |
| Bay |
Low |
24 |
45.8% |
| Benzie |
Low |
5 |
— |
| Berrien |
Low |
29 |
37.9% |
| Cheboygan |
Low |
7 |
— |
| Chippewa |
Low |
6 |
— |
| Clare |
Low |
7 |
— |
| Crawford |
Low |
— |
— |
| Delta |
Low |
10 |
40% |
| Gladwin |
Low |
4 |
— |
| Grand Traverse |
Low |
18 |
38.9% |
| Gratiot |
Low |
7 |
— |
| Huron |
Low |
8 |
— |
| Iosco |
Low |
7 |
57.1% |
| Isabella |
Low |
8 |
62.5% |
| Kalkaska |
Low |
4 |
— |
| Lake |
Low |
— |
— |
| Luce |
Low |
— |
— |
| Mackinac |
Low |
— |
— |
| Macomb |
Low |
184 |
34.8% |
| Manistee |
Low |
6 |
66.7% |
| Mason |
Low |
7 |
57.1% |
| Mecosta |
Low |
9 |
— |
| Midland |
Low |
20 |
35% |
| Missaukee |
Low |
— |
— |
| Muskegon |
Low |
30 |
43.3% |
| Newaygo |
Low |
7 |
85.7% |
| Oceana |
Low |
5 |
— |
| Ogemaw |
Low |
9 |
— |
| Ontonagon |
Low |
— |
— |
| Osceola |
Low |
5 |
— |
| Oscoda |
Low |
— |
— |
| Ottawa |
Low |
42 |
31% |
| Roscommon |
Low |
8 |
50% |
| Saginaw |
Low |
37 |
37.8% |
| Schoolcraft |
Low |
— |
— |
| St. Clair |
Low |
31 |
51.6% |
| Tuscola |
Low |
13 |
— |
| Van Buren |
Low |
12 |
50% |
| Wayne |
Low |
356 |
35.4% |
| Wexford |
Low |
7 |
— |
Sources: EPA Map of Radon Zones, CDC Environmental Health Tracking Network
Frequently Asked Questions
How many counties in Michigan have high radon risk?
Michigan has 9 counties classified as EPA Zone 1 (high radon risk), 32 as Zone 2 (moderate), and 42 as Zone 3 (low risk).
Is radon a problem in Michigan?
Michigan has 9 high-risk counties where elevated radon is likely. The EPA recommends all homes in Michigan be tested for radon, regardless of which zone they're in.
How do I check radon levels for my Michigan address?
Enter your ZIP code in the search box above to see your county's EPA radon zone and available testing data. For your specific home's radon level, you'll need a radon test kit.