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

EPA places Gilmer County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Rank it against the rest of the country and Gilmer County lands in the 37th percentile for radon potential.

Where Gilmer County sits nationally

Gilmer County, West Virginia is home to about 7,116 people across 338.503 square miles. That works out to roughly 21 people per square mile. By population, Gilmer County is the 898th largest of every county sharing its EPA zone — the 13th percentile by population within that zone. Gilmer County falls in EPA Radon Region 3, one of 245 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Gilmer County

Gilmer 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. Middle-of-the-pack doesn't mean risk-free for any one Gilmer County address — a moderate county average still leaves individual homes to test either side of it.

Testing and mitigation in Gilmer County

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

Where Gilmer 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 Gilmer County carries, the zone explainer covers what it does and doesn't tell you about any one house.