Iowa radon levels by county

Iowa Radon Levels by County

Iowa has some of the highest indoor radon in the country — and it varies sharply by county. Below is the measured average for every Iowa 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
Marion County →	8.5	6.5×	Above action level
Woodbury County →	7.9	6.1×	Above action level
Polk County →	7.3	5.6×	Above action level
Dallas County →	6.7	5.2×	Above action level
Cerro Gordo County →	6.7	5.2×	Above action level
Story County →	6.5	5×	Above action level
Pottawattamie County →	6.4	4.9×	Above action level
Dubuque County →	5.6	4.3×	Above action level
Black Hawk County →	5.5	4.2×	Above action level
Scott County →	4.9	3.8×	Above action level
Linn County →	4.8	3.7×	Above action level
Johnson County →	4.7	3.6×	Above action level

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

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