Is Alleghany County, VA a radon risk area?

Alleghany County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Nationally, Alleghany County ranks higher in radon potential than 79% of rated counties (the 79th percentile).

Where Alleghany County sits nationally

About 14,632 people live in Alleghany County, Virginia, spread over 446.572 square miles. Population density there runs about 33 people per square mile. Rank 667 by population within its EPA zone puts Alleghany County at the 37th percentile among zone peers. Geologically, Alleghany County is grouped into EPA Region 3 alongside 244 other counties that share its rock and soil setting.

What this actually means for a house in Alleghany County

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Alleghany County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. Being in Zone 1 raises the odds Alleghany County homes test above the action level, but it does not mean any specific house does — EPA recommends every home be tested, in every zone, because the only way to know is to test.

Testing and mitigation in Alleghany County

Nothing about Alleghany 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

Alleghany County's test kit answers today; a Airthings radon monitor keeps answering for Alleghany County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Alleghany County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.