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

EPA places Lincoln 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. That puts Lincoln County in the 83rd percentile nationally for radon potential — higher than 83% of the counties EPA has rated.

How Lincoln County compares

Lincoln County, Kentucky is home to about 24,910 people across 332.904 square miles. Averaged across its land area, Lincoln County runs about 75 people per square mile. By population, Lincoln County is the 517th largest of every county sharing its EPA zone — the 52nd percentile by population within that zone. Lincoln 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

Where the national indoor average runs about 1.3 pCi/L, Lincoln County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. 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 Lincoln County will test well under the action level, and EPA's guidance is to test regardless of zone.

Testing and mitigation in Lincoln County

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

Where Lincoln County's figures come from

Lincoln 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.