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Counties with the Highest Radon Potential in Utah

The top 25 of 29 Utah counties on GIS Map, ranked by EPA radon zone, where zone 1 carries the highest predicted indoor radon potential and zone 3 the lowest.

#CountyEPA radon zone
1Beaver County
2
2Box Elder County
2
3Cache County
2
4Daggett County
2
5Davis County
2
6Emery County
2
7Garfield County
2
8Iron County
2
9Juab County
2
10Kane County
2
11Millard County
2
12Morgan County
2
13Rich County
2
14Salt Lake County
2
15San Juan County
2
16Summit County
2
17Tooele County
2
18Utah County
2
19Wasatch County
2
20Washington County
2
21Wayne County
2
22Weber County
2
23Carbon County
1
24Duchesne County
1
25Grand County
1

Source: EPA Map of Radon Zones (September 2025). All counties with data are ranked. Estimates carry margins of error.

Citing this page: GIS Map, “Counties with the Highest Radon Potential in Utah”, https://gismap.land/rankings/utah/highest-radon-counties. Figures from EPA Map of Radon Zones (September 2025).

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