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

EPA places Webster 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. Webster County sits at the 38th percentile nationally for radon potential — above 38 of every 100 rated counties.

Where Webster County sits nationally

Webster County, West Virginia is home to about 7,947 people across 553.47 square miles. Population density there runs about 14 people per square mile. By population, Webster County is the 870th largest of every county sharing its EPA zone — the 16th percentile by population within that zone. EPA's geology-based Region 3 groups Webster County with 244 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Call it a middle case: above the 1.3 pCi/L most US homes average, below the 4 pCi/L line EPA uses to recommend mitigation — that's Webster County's Zone 2 prediction. Webster County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

Next steps for a home in Webster County

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

Where Webster County's figures come from

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