North Dakota has 53 counties, with 53 classified as EPA Zone 1 (highest risk). With an average radon level of 9.71 pCi/L, North Dakota state testing data reveals significantly elevated risks across multiple counties. Testing is highly recommended.
North Dakota is the 19th most expansive state in terms of size but the 3rd least populous. It also happens to be the 4th least densely populated state in the entire US.
North Dakota 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 |
|---|---|---|
| Grand Forks | 13.50 pCi/L | 8 |
| Grafton | 7.67 pCi/L | 3 |
| Dickinson | 6.00 pCi/L | 3 |
| Watford City | 5.50 pCi/L | 2 |
| Bismarck | No submissions | 0 |
All 53 North Dakota counties with their EPA radon zone classification and user-submitted average radon levels.
Browse radon data for individual cities across North Dakota. Each city page includes user-submitted radon levels, local contractors, and mitigation resources.