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Colorado radon levels by county

Colorado Radon Levels by County

Colorado has some of the highest indoor radon in the country — and it varies sharply by county. Below is the measured average for every Colorado county we serve (CDC test data, 2008–2017), compared to the U.S. average of 1.3 pCi/L and the EPA action level of 4.0. Find your county to see what's typical and what to do next.

County Avg radon (pCi/L) vs U.S. Status
Denver County → 6.4 4.9× Above action level
El Paso County → 6.4 4.9× Above action level
Arapahoe County → 6.4 4.9× Above action level
Larimer County → 6.2 4.8× Above action level
Jefferson County → 6.4 4.9× Above action level
Boulder County → 6.4 4.9× Above action level
Weld County → 6.4 4.9× Above action level
Douglas County → 6.4 4.9× Above action level
Pueblo County → 6.4 4.9× Above action level
Mesa County → 6.4 4.9× Above action level

Source: CDC National Environmental Public Health Tracking Network — mean pre-mitigation radon level in tested buildings, Colorado, 2008–2017. Every home should be tested regardless of county average.

Find Out Your Home's Radon Level

Colorado Radon Experts routes you to an NRPP-certified Colorado partner contractor for testing or mitigation. Free quote.

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