Radon and drinking water by state
Each state page lists every county with its EPA radon zone, the community water systems that serve it and their health violations since 2016.
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| State | Counties | High potential (Zone 1) | City water reports |
|---|---|---|---|
| Arizona | 15 | 0 | 1 |
| California | 58 | 2 | 2 |
| Colorado | 64 | 53 | 0 |
| Florida | 67 | 0 | 1 |
| Idaho | 44 | 19 | 0 |
| Illinois | 102 | 56 | 1 |
| Iowa | 99 | 99 | 0 |
| Michigan | 83 | 9 | 0 |
| Minnesota | 87 | 68 | 0 |
| New Jersey | 21 | 7 | 0 |
| New York | 62 | 34 | 1 |
| Ohio | 88 | 53 | 0 |
| Pennsylvania | 67 | 49 | 1 |
| Texas | 254 | 0 | 3 |
| Utah | 29 | 7 | 0 |