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

EPA's own radon map rates Randolph County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. That puts Randolph County in the 49th percentile nationally for radon potential — higher than 49% of the counties EPA has rated.

Where Randolph County sits nationally

Randolph County, West Virginia is home to about 27,190 people across 1,039.7 square miles. Averaged across its land area, Randolph County runs about 26 people per square mile. By population, Randolph County is the 520th largest of every county sharing its EPA zone — the 50th percentile by population within that zone. EPA's geology-based Region 3 groups Randolph County with 244 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Randolph 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). A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Randolph County — testing is the only way to know an individual home's actual level.

Testing and mitigation in Randolph County

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

Where Randolph County's figures come from

Randolph County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.