Utah's Radon Problem by the Numbers
Utah consistently ranks among the top states for indoor radon exposure. The combination of uranium-rich granite and shale bedrock, high-altitude geography, and cold winters creates ideal conditions for radon accumulation.
County Risk Levels
High-Risk Counties (Zone 1)
- Utah County — Average indoor radon: 7.2 pCi/L
- Salt Lake County — Average indoor radon: 5.8 pCi/L
- Davis County — Average indoor radon: 6.1 pCi/L
- Weber County — Average indoor radon: 5.4 pCi/L
Moderate-Risk Counties (Zone 2)
- Washington County — Average indoor radon: 3.2 pCi/L
- Cache County — Average indoor radon: 4.1 pCi/L
What This Means for You
If you live along the Wasatch Front, your home has a high probability of elevated radon. There is no safe level of radon — the WHO recommends mitigation at 2.7 pCi/L and the EPA recommends considering it at 2.0 pCi/L. But even in moderate-risk areas, individual homes can test significantly above these thresholds. The only way to know is to test.
