Monroe County, OH radon potential

Monroe County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. That puts Monroe County in the 42nd percentile nationally for radon potential — higher than 42% of the counties EPA has rated.

Monroe County by the numbers

Monroe County, Ohio is home to about 13,051 people across 455.581 square miles. Averaged across its land area, Monroe County runs about 29 people per square mile. Within its own EPA zone, Monroe County is bigger by population than 27% of the counties that share it. EPA's geology-based Region 5 groups Monroe County with 523 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Monroe County's Zone 2 prediction lands in the gap between the two. A county-wide moderate average, like Monroe County's, can still hide a specific house well above or below it — testing is what actually answers the question.

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

Where Monroe County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Monroe County's numbers. Whatever zone Monroe County carries, the zone explainer covers what it does and doesn't tell you about any one house.