Wayne County, OH radon potential

EPA's own radon map rates Wayne County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Nationally, Wayne County ranks higher in radon potential than 95% of rated counties (the 95th percentile).

Where Wayne County sits nationally

Wayne County, Ohio is home to about 116,632 people across 555.017 square miles. Population density there runs about 210 people per square mile. Within its own EPA zone, Wayne County is bigger by population than 84% of the counties that share it. Wayne County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Wayne County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. A Zone 1 rating means testing is worth doing sooner rather than later, but it is still county-wide average, not a reading for any single house — some homes in Wayne County will test well under the action level, and EPA's guidance is to test regardless of zone.

Testing and mitigation in Wayne County

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 Wayne County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Wayne 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 Wayne County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Wayne County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.