Is Hampshire County, WV a radon risk area?

EPA places Hampshire County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally, Hampshire County ranks higher in radon potential than 83% of rated counties (the 83rd percentile).

Hampshire County by the numbers

About 23,793 people live in Hampshire County, West Virginia, spread over 640.402 square miles. Population density there runs about 37 people per square mile. Rank 525 by population within its EPA zone puts Hampshire County at the 51st percentile among zone peers. Geologically, Hampshire County is grouped into EPA Region 3 alongside 244 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Hampshire County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. That doesn't mean every Hampshire County house tests high — a zone is a county-wide prediction, never a single-home reading — but it's a reason to test sooner rather than let it wait.

If Hampshire County tests above the action level

Nothing about Hampshire County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find West Virginia's state radon program

Hampshire County's test kit answers today; a Airthings radon monitor keeps answering for Hampshire County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Hampshire County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.