Is Roanoke County, VA a radon risk area?

EPA's own radon map rates Roanoke County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Rank it against the rest of the country and Roanoke County lands in the 94th percentile for radon potential.

How Roanoke County compares

About 97,334 people live in Roanoke County, Virginia, spread over 250.549 square miles. Population density there runs about 388 people per square mile. Rank 204 by population within its EPA zone puts Roanoke County at the 81st percentile among zone peers. Geologically, Roanoke County is grouped into EPA Region 3 alongside 244 other counties that share its rock and soil setting.

Zone vs. an actual test

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Roanoke County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. 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 Roanoke County will test well under the action level, and EPA's guidance is to test regardless of zone.

Testing and mitigation in Roanoke County

Nothing about Roanoke 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

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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.