Is Carroll County, VA a radon risk area?

EPA places Carroll 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. Carroll County sits at the 50th percentile nationally for radon potential — above 50 of every 100 rated counties.

Carroll County by the numbers

About 29,242 people live in Carroll County, Virginia, spread over 474.742 square miles. Averaged across its land area, Carroll County runs about 62 people per square mile. Rank 491 by population within its EPA zone puts Carroll County at the 52nd percentile among zone peers. EPA's geology-based Region 3 groups Carroll County with 244 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

EPA's Zone 2 rating for Carroll County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. Nothing about a Zone 2 label lowers the case for testing in Carroll County — EPA recommends it in every zone, moderate included.

Next steps for a home in Carroll County

Nothing about Carroll 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 Virginia's state radon program

Carroll County's test kit answers today; a Airthings radon monitor keeps answering for Carroll 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

Carroll County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Carroll County carries, the zone explainer covers what it does and doesn't tell you about any one house.