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Radon zones in North Dakota

The EPA assigns every county in North Dakota to one of three radon potential zones. Every one of its 53 counties is in Zone 1, the highest category, where the predicted average indoor screening level is above the EPA action level of 4 pCi/L.

53
Counties
53
Zone 1 counties
Predicted average above 4 pCi/L
0
Zone 2 counties
Predicted average 2-4 pCi/L
0
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across North Dakota

Every county in North Dakota, filled by the zone the EPA assigns it. Zones follow geology rather than county lines, so the colour usually changes where the bedrock does, not where the border is.

Zone 1 · 53Zone 2 · 0Zone 3 · 0

Hover a county · click to open it

County by county

All 53 North Dakota counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
Adams County12,1639.2%15.3% -
Barnes County111k7.0%13.3%27.2
Benson County15,7459.8%22.0%48.0
Billings County11,0347.2%13.5% -
Bottineau County16,3497.3%13.4% -
Bowman County12,8677.4%13.6% -
Burke County12,1346.7%13.1% -
Burleigh County1100k5.6%11.8%26.2
Cass County1196k4.5%11.2%31.4
Cavalier County13,5967.2%12.4% -
Dickey County14,9007.0%13.8% -
Divide County12,1357.8%14.1% -
Dunn County14,0196.8%14.8% -
Eddy County12,2638.7%16.2% -
Emmons County13,2248.8%14.7% -
Foster County13,3097.2%13.3% -
Golden Valley County11,7438.8%15.6% -
Grand Forks County173k5.3%11.3%33.1
Grant County12,21510.3%16.4% -
Griggs County12,2487.7%12.3% -
Hettinger County12,4157.5%14.5% -
Kidder County12,3428.1%14.5% -
LaMoure County14,0968.0%13.8% -
Logan County11,8698.9%14.9% -
McHenry County15,1317.6%15.2%39.8
McIntosh County12,4889.7%15.6% -
McKenzie County114k5.6%15.2% -
McLean County19,8327.2%13.6%23.3
Mercer County18,3097.9%15.1%24.8
Morton County134k5.9%13.5%26.5
Mountrail County19,3837.3%19.2% -
Nelson County12,9917.5%13.2% -
Oliver County11,8797.0%13.1% -
Pembina County16,6617.8%14.7%33.4
Pierce County13,9027.5%14.2% -
Ramsey County111k7.9%15.4%43.4
Ransom County15,6037.4%14.8% -
Renville County12,2796.9%14.1% -
Richland County117k6.6%13.2%20.8
Rolette County112k9.7%25.9%63.9
Sargent County13,7767.0%13.8%52.0
Sheridan County11,2669.0%13.8% -
Sioux County13,64312.2%32.9% -
Slope County16749.4%15.2% -
Stark County133k6.0%14.1%32.3
Steele County11,7827.9%14.2% -
Stutsman County121k7.3%15.3%33.4
Towner County12,0309.9%16.9% -
Traill County17,9086.2%12.3%25.0
Walsh County110k7.8%14.8%31.5
Ward County168k5.2%12.6%32.1
Wells County13,8769.0%14.7% -
Williams County139k5.4%15.6%36.9

Zones from the EPA Map of Radon Zones. COPD and smoking are CDC PLACES model-based estimates of adult prevalence. Lung cancer death rates are age-adjusted deaths per 100,000 per year, 2019-2023, from NCI State Cancer Profiles. A dash means the source does not report a value for that county.

Other states

Radon zones elsewhere