Radon zones in North Dakota
Last updated
EPA’s Map of Radon Zones places 53 North Dakota counties in its three radon potential zones: 53 in Zone 1 (highest), 0 in Zone 2 (moderate), and 0 in Zone 3 (low).
What this means for North Dakota homes
Most North Dakota counties fall in Zone 1. EPA predicts average indoor screening levels above 4 pCi/L across much of North Dakota, so elevated radon is common. Testing is especially worthwhile here, and radon-resistant construction features make sense for new homes.
EPA’s guidance is the same everywhere: test your home, fix it if the level is 4 pCi/L or higher, and consider fixing between 2 and 4 pCi/L. The zone map is from 1993 and should not be used to decide whether a single home needs testing.
North Dakota radon program
EPA lists the following state contact for North Dakota: ND Department of Environmental Quality, phone 701-328-5166. Website: deq.nd.gov/WM/Radon. State programs can tell you about local testing data, free or discounted test kits, disclosure rules for home sales, and credentialed radon professionals.
North Dakota counties and their EPA radon zones
| County | EPA radon zone |
|---|---|
| Adams County | Zone 1 |
| Barnes County | Zone 1 |
| Benson County | Zone 1 |
| Billings County | Zone 1 |
| Bottineau County | Zone 1 |
| Bowman County | Zone 1 |
| Burke County | Zone 1 |
| Burleigh County | Zone 1 |
| Cass County | Zone 1 |
| Cavalier County | Zone 1 |
| Dickey County | Zone 1 |
| Divide County | Zone 1 |
| Dunn County | Zone 1 |
| Eddy County | Zone 1 |
| Emmons County | Zone 1 |
| Foster County | Zone 1 |
| Golden Valley County | Zone 1 |
| Grand Forks County | Zone 1 |
| Grant County | Zone 1 |
| Griggs County | Zone 1 |
| Hettinger County | Zone 1 |
| Kidder County | Zone 1 |
| LaMoure County | Zone 1 |
| Logan County | Zone 1 |
| McHenry County | Zone 1 |
| McIntosh County | Zone 1 |
| McKenzie County | Zone 1 |
| McLean County | Zone 1 |
| Mercer County | Zone 1 |
| Morton County | Zone 1 |
| Mountrail County | Zone 1 |
| Nelson County | Zone 1 |
| Oliver County | Zone 1 |
| Pembina County | Zone 1 |
| Pierce County | Zone 1 |
| Ramsey County | Zone 1 |
| Ransom County | Zone 1 |
| Renville County | Zone 1 |
| Richland County | Zone 1 |
| Rolette County | Zone 1 |
| Sargent County | Zone 1 |
| Sheridan County | Zone 1 |
| Sioux County | Zone 1 |
| Slope County | Zone 1 |
| Stark County | Zone 1 |
| Steele County | Zone 1 |
| Stutsman County | Zone 1 |
| Towner County | Zone 1 |
| Traill County | Zone 1 |
| Walsh County | Zone 1 |
| Ward County | Zone 1 |
| Wells County | Zone 1 |
| Williams County | Zone 1 |
County names follow the 2020 Census. Zones from the EPA Map of Radon Zones (text version). Rows marked “zone of” use the zone EPA gave the predecessor or surrounding county.
Next steps: read how to test your home, check a result with the level calculator, or look up a single address by ZIP code.