Monroe County, WV: EPA's radon zone, explained

Monroe County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Monroe County sits at the 77th percentile nationally for radon potential — above 77 of every 100 rated counties.

How Monroe County compares

Monroe County, West Virginia is home to about 12,462 people across 472.754 square miles. Averaged across its land area, Monroe County runs about 26 people per square mile. By population, Monroe County is the 710th largest of every county sharing its EPA zone — the 33rd percentile by population within that zone. EPA's geology-based Region 3 groups Monroe County with 244 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Monroe 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 Monroe County specifically.

If Monroe County tests above the action level

For a Monroe County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find West Virginia'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

Monroe County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.