Alpha Energy Laboratories · 2015–2025
Utah Radon Levels by
County & City
Real pre-mitigation radon measurements from 115,601 Utah homes. Find your county or city to see what your neighbors' homes are actually measuring.
115,601
Tests Analyzed
29
Counties Covered
199+
Cities with Data
48.3%
Above WHO Threshold
How to Read Utah's Radon Data
Radon is measured in picocuries per liter of air (pCi/L). The World Health Organization recommends mitigation at 2.7 pCi/L. The EPA recommends considering action at 4.0 pCi/L. The US national average is 1.3 pCi/L.
Utah's statewide average based on real test data is 4.4 pCi/L — more than 3× the national average. 48.3% of tested Utah homes exceeded the WHO's mitigation threshold. There is no safe level of radon exposure.
All data comes from Alpha Energy Laboratories, an EPA-certified independent lab that analyzes the majority of Utah's radon test results. These are pre-mitigation readings from real homes — not estimates or projections.
Risk Level Guide
Elevated = above WHO 2.7 pCi/L · High = above EPA 4.0 pCi/L
All 29 Utah Counties
Radon Levels by County
Sorted highest to lowest. Click any county to see city-level breakdowns and year-over-year trends.
Beaver County
170 tests · 1 cities
Piute County
16 tests
Wasatch County
1,754 tests · 4 cities
Wayne County
77 tests
Box Elder County
1,582 tests · 11 cities
Cache County
4,785 tests · 15 cities
Rich County
55 tests · 1 cities
Juab County
241 tests · 2 cities
Sevier County
524 tests · 7 cities
Morgan County
817 tests · 2 cities
Emery County
253 tests · 5 cities
Tooele County
3,378 tests · 8 cities
Weber County
6,237 tests · 18 cities
Millard County
243 tests · 3 cities
Sanpete County
862 tests · 9 cities
Utah County
26,930 tests · 26 cities
Garfield County
76 tests · 1 cities
Davis County
12,297 tests · 15 cities
Summit County
2,523 tests · 9 cities
San Juan County
155 tests · 2 cities
Salt Lake County
45,769 tests · 22 cities
Uintah County
1,424 tests · 9 cities
Duchesne County
959 tests · 8 cities
Grand County
331 tests · 1 cities
Kane County
179 tests · 1 cities
Carbon County
853 tests · 4 cities
Iron County
804 tests · 3 cities
Daggett County
74 tests · 1 cities
Washington County
2,233 tests · 11 cities
Data source: Alpha Energy Laboratories (alphaenergylabs.com) — an independent EPA-certified radon measurement laboratory. Dataset covers 115,601 pre-mitigation indoor radon tests performed in Utah from 2015 through August 2025. Updated September 2025.
County averages don't tell your home's story
Two homes on the same block can have dramatically different radon levels. The only way to know is to test. Free kit — free shipping — free lab analysis.
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