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

EPA's own radon map rates Calhoun County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Rank it against the rest of the country and Calhoun County lands in the 36th percentile for radon potential.

How Calhoun County compares

Calhoun County, West Virginia is home to about 5,873 people across 279.263 square miles. Averaged across its land area, Calhoun County runs about 21 people per square mile. By population, Calhoun County is the 923rd largest of every county sharing its EPA zone — the 11th percentile by population within that zone. Geologically, Calhoun County is grouped into EPA Region 3 alongside 244 other counties that share its rock and soil setting.

Zone vs. an actual test

Calhoun County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). Middle-of-the-pack doesn't mean risk-free for any one Calhoun County address — a moderate county average still leaves individual homes to test either side of it.

Testing and mitigation in Calhoun County

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

Where Calhoun County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Calhoun County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.