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

Lincoln County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. That puts Lincoln County in the 50th percentile nationally for radon potential — higher than 50% of the counties EPA has rated.

Lincoln County by the numbers

Lincoln County, Wisconsin is home to about 28,461 people across 878.778 square miles. That works out to roughly 32 people per square mile. By population, Lincoln County is the 500th largest of every county sharing its EPA zone — the 52nd percentile by population within that zone. Lincoln County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Lincoln 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. Middle-of-the-pack doesn't mean risk-free for any one Lincoln County address — a moderate county average still leaves individual homes to test either side of it.

Next steps for a home 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 Wisconsin'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. Code RADONZONE-10OFF takes 10% off at checkout.

Where Lincoln County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Lincoln County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.