Bell County, KY: EPA's radon zone, explained

EPA places Bell 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. That puts Bell County in the 47th percentile nationally for radon potential — higher than 47% of the counties EPA has rated.

How Bell County compares

Bell County, Kentucky is home to about 23,051 people across 358.999 square miles. Population density there runs about 64 people per square mile. By population, Bell County is the 579th largest of every county sharing its EPA zone — the 44th percentile by population within that zone. Bell County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Bell County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Bell County — testing is the only way to know an individual home's actual level.

If Bell County tests above the action level

For a Bell 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 Kentucky's state radon program

For Bell County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Bell 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 Bell County's figures come from

Bell 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.