Is Lamar County, AL a radon risk area?

EPA's own radon map rates Lamar 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 Lamar County lands in the 42nd percentile for radon potential.

Lamar County by the numbers

About 13,543 people live in Lamar County, Alabama, spread over 604.783 square miles. That works out to roughly 22 people per square mile. Rank 740 by population within its EPA zone puts Lamar County at the 28th percentile among zone peers. EPA's geology-based Region 4 groups Lamar County with 735 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Lamar County

Lamar 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 Lamar County address — a moderate county average still leaves individual homes to test either side of it.

If Lamar County tests above the action level

Nothing about Lamar 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 Alabama's state radon program

Lamar County's test kit answers today; a Airthings radon monitor keeps answering for Lamar 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

Lamar County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Lamar County carries, the zone explainer covers what it does and doesn't tell you about any one house.