Ohio radon levels by county

Ohio Radon Levels by County

Ohio has some of the highest indoor radon in the country — and it varies sharply by county. Below is the measured average for every Ohio 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
Licking County →	15.5	11.9×	Above action level
Richland County →	11	8.5×	Above action level
Fairfield County →	10.9	8.4×	Above action level
Franklin County →	9.5	7.3×	Above action level
Stark County →	8	6.2×	Above action level
Clark County →	7.7	5.9×	Above action level
Allen County →	7.6	5.8×	Above action level
Montgomery County →	5.7	4.4×	Above action level
Summit County →	4.8	3.7×	Above action level
Lucas County →	4.7	3.6×	Above action level
Hamilton County →	4.1	3.2×	Above action level
Mahoning County →	3.2	2.5×	Below action level
Cuyahoga County →	3	2.3×	Below action level

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

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