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Radon zones in Utah

The EPA assigns every county in Utah to one of three radon potential zones. 7 are in Zone 1, the highest category, home to about 4% of the state's residents.

29
Counties
7
Zone 1 counties
Predicted average above 4 pCi/L
22
Zone 2 counties
Predicted average 2-4 pCi/L
0
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across Utah

Every county in Utah, 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 · 7Zone 2 · 22Zone 3 · 0

Hover a county · click to open it

County by county

All 29 Utah counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
Carbon County121k7.7%11.9%30.7
Duchesne County120k7.0%11.8%21.0
Grand County19,7066.6%10.2% -
Piute County11,55010.3%12.3% -
Sanpete County130k6.7%11.2%12.3
Sevier County122k6.6%10.4%17.0
Uintah County138k6.5%12.6%18.3
Beaver County27,2335.5%9.3% -
Box Elder County263k5.6%9.8%16.9
Cache County2142k4.6%8.1%11.2
Daggett County29928.2%11.0% -
Davis County2373k4.2%7.4%15.0
Emery County210k6.9%11.0%26.8
Garfield County25,3146.6%9.3% -
Iron County264k5.8%9.9%15.7
Juab County213k5.7%10.3% -
Kane County28,4256.9%9.3% -
Millard County213k7.0%10.8% -
Morgan County213k4.4%7.6% -
Rich County22,6706.9%10.1% -
Salt Lake County21.2M4.4%8.2%16.1
San Juan County214k8.9%15.7% -
Summit County243k4.3%6.6%10.4
Tooele County282k4.6%9.5%21.9
Utah County2719k3.6%6.4%11.1
Wasatch County237k4.5%7.3%10.2
Washington County2202k6.2%8.0%15.6
Wayne County22,6148.1%10.7% -
Weber County2272k4.9%9.1%18.3

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.

Highest potential

Zone 1 counties in Utah

These 7 counties have a predicted average indoor radon screening level above the EPA action level. The EPA recommends every home in them be tested.

Other states

Radon zones elsewhere