Lewis County, WV radon potential

EPA's own radon map rates Lewis County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Lewis County sits at the 44th percentile nationally for radon potential — above 44 of every 100 rated counties.

Where Lewis County sits nationally

Lewis County, West Virginia is home to about 16,477 people across 386.932 square miles. That works out to roughly 43 people per square mile. Within its own EPA zone, Lewis County is bigger by population than 34% of the counties that share it. EPA's geology-based Region 3 groups Lewis County with 244 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

EPA's Zone 2 rating for Lewis County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. Middle-of-the-pack doesn't mean risk-free for any one Lewis County address — a moderate county average still leaves individual homes to test either side of it.

Testing and mitigation in Lewis County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find West Virginia's state radon program

For Lewis County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Lewis 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 Lewis 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. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.