Is Lincoln County, AR a radon risk area?

Lincoln County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally that's the 9th percentile for radon potential — Lincoln County outranks 9% of every county EPA has rated.

How Lincoln County compares

About 12,868 people live in Lincoln County, Arkansas, spread over 559.466 square miles. Population density there runs about 23 people per square mile. Rank 755 by population within its EPA zone puts Lincoln County at the 27th percentile among zone peers. Geologically, Lincoln County is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

A Zone 3 county like Lincoln County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Lincoln County testing above the action level often enough that skipping a test isn't the safe assumption.

If Lincoln County tests above the action level

Nothing about Lincoln County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Arkansas's state radon program

Lincoln County's test kit answers today; a Airthings radon monitor keeps answering for Lincoln County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Lincoln County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.