Henry County, OH radon potential

EPA's own radon map rates Henry County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Rank it against the rest of the country and Henry County lands in the 50th percentile for radon potential.

Where Henry County sits nationally

Henry County, Ohio is home to about 27,536 people across 416.013 square miles. Averaged across its land area, Henry County runs about 66 people per square mile. Within its own EPA zone, Henry County is bigger by population than 50% of the counties that share it. Henry County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Henry County

Henry County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. A county-wide moderate average, like Henry County's, can still hide a specific house well above or below it — testing is what actually answers the question.

If Henry County tests above the action level

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Ohio's state radon program

For Henry County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Henry County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

Where Henry County's figures come from

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Henry County carries, the zone explainer covers what it does and doesn't tell you about any one house.