Botetourt County, VA: EPA's radon zone, explained

EPA places Botetourt County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Botetourt County sits at the 86th percentile nationally for radon potential — above 86 of every 100 rated counties.

How Botetourt County compares

Botetourt County, Virginia is home to about 34,129 people across 541.276 square miles. Population density there runs about 63 people per square mile. By population, Botetourt County is the 430th largest of every county sharing its EPA zone — the 60th percentile by population within that zone. Botetourt County falls in EPA Radon Region 3, one of 245 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Where the national indoor average runs about 1.3 pCi/L, Botetourt County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. Some Botetourt County homes will test comfortably under the action level despite the county's Zone 1 rating — the only way to know which kind of home you have is an actual test.

Testing and mitigation in Botetourt County

For a Botetourt 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 Virginia's state radon program

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

Where Botetourt 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. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.