Michigan has 82 counties, with 8 classified as EPA Zone 1 (highest risk). With an average radon level of 6.61 pCi/L, Michigan state testing data reveals significantly elevated risks across multiple counties. Testing is highly recommended.
Michigan is the 11th most expansive state in terms of size and the 9th most populous. According to a survey conducted during the 1987-88 winter season it was discovered that approximately 12 percent of the homes in the state (nearly one in eight) have radon levels exceeding 4 pCi/l which is the recommended action level set by EPA. Furthermore, in some counties, as many as 40-45 percent (or more) of the homes were found to have levels well over the 4 pCi/l guideline.
Michigan does have an active radon program, dedicated to educating citizens about the risks associated with the deadly gas. You can find more information on Radon, testing and mitigation at the official page.
Explore radon data organized by metro region, including average levels, hotspot cities, and local mitigation professionals.
Cities with the most user-submitted radon test data, ranked by number of submissions.
| City | Avg User Radon Level | Submissions |
|---|---|---|
| Novi | 5.00 pCi/L | 7 |
| Rochester | 9.00 pCi/L | 5 |
| Battle Creek | 6.60 pCi/L | 5 |
| White Lake | 10.00 pCi/L | 4 |
| Ypsilanti | 8.50 pCi/L | 4 |
| Waterford | 7.75 pCi/L | 4 |
| Howell | 7.50 pCi/L | 4 |
| Gaylord | 6.00 pCi/L | 4 |
| Gladstone | 5.25 pCi/L | 4 |
| West Bloomfield | 5.25 pCi/L | 4 |
| Clarkston | 5.00 pCi/L | 4 |
| Flint | 9.00 pCi/L | 3 |
| Pinckney | 7.33 pCi/L | 3 |
| Northville | 5.33 pCi/L | 3 |
| Milford | 4.33 pCi/L | 3 |
| Plymouth | 4.33 pCi/L | 3 |
| Portage | 3.33 pCi/L | 3 |
| Lake Orion | 11.00 pCi/L | 2 |
| Oxford | 11.00 pCi/L | 2 |
| Grand Ledge | 7.00 pCi/L | 2 |
All 82 Michigan counties with their EPA radon zone classification and user-submitted average radon levels.
Browse radon data for individual cities across Michigan. Each city page includes user-submitted radon levels, local contractors, and mitigation resources.