Is Ohio County, WV a radon risk area?

EPA places Ohio 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, Ohio County ranks higher in radon potential than 88% of rated counties (the 88th percentile).

How Ohio County compares

About 41,090 people live in Ohio County, West Virginia, spread over 106.035 square miles. That works out to roughly 388 people per square mile. Rank 372 by population within its EPA zone puts Ohio County at the 65th percentile among zone peers. EPA's geology-based Region 3 groups Ohio County with 244 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Ohio County

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Ohio County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. A Zone 1 rating means testing is worth doing sooner rather than later, but it is still county-wide average, not a reading for any single house — some homes in Ohio County will test well under the action level, and EPA's guidance is to test regardless of zone.

Next steps for a home in Ohio County

Nothing about Ohio 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

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

More on how this number was built

Ohio 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.