Perry County, OH radon potential

Perry County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Nationally that's the 87th percentile for radon potential — Perry County outranks 87% of every county EPA has rated.

Where Perry County sits nationally

Perry County, Ohio is home to about 35,682 people across 407.94 square miles. Population density there runs about 87 people per square mile. Within its own EPA zone, Perry County is bigger by population than 61% of the counties that share it. Geologically, Perry County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

What this actually means for a house in Perry County

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Perry County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Perry County specifically.

Next steps for a home in Perry 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 Perry County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Perry County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

Where Perry 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. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.