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

Campbell County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Rank it against the rest of the country and Campbell County lands in the 91st percentile for radon potential.

Where Campbell County sits nationally

Campbell County, Virginia is home to about 55,342 people across 503.257 square miles. Population density there runs about 110 people per square mile. By population, Campbell County is the 291st largest of every county sharing its EPA zone — the 73rd percentile by population within that zone. Campbell 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, Campbell County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. Being in Zone 1 raises the odds Campbell 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.

If Campbell County tests above the action level

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

Where Campbell County's figures come from

Campbell 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.