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

EPA's own radon map rates Lincoln County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Rank it against the rest of the country and Lincoln County lands in the 57th percentile for radon potential.

How Lincoln County compares

Lincoln County, Missouri is home to about 65,888 people across 626.566 square miles. That works out to roughly 105 people per square mile. By population, Lincoln County is the 283rd largest of every county sharing its EPA zone — the 73rd percentile by population within that zone. Lincoln County falls in EPA Radon Region 7, one of 412 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Lincoln County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). A county-wide moderate average, like Lincoln County's, can still hide a specific house well above or below it — testing is what actually answers the question.

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 Missouri'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. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.