Is Lawrence County, AR a radon risk area?

EPA places Lawrence County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally that's the 11th percentile for radon potential — Lawrence County outranks 11% of every county EPA has rated.

Lawrence County by the numbers

About 16,305 people live in Lawrence County, Arkansas, spread over 587.528 square miles. That works out to roughly 28 people per square mile. Rank 685 by population within its EPA zone puts Lawrence County at the 34th percentile among zone peers. Geologically, Lawrence 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 Lawrence County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Don't read Zone 3 as a pass for Lawrence County — EPA's guidance to test every home makes no exception for counties predicted low.

If Lawrence County tests above the action level

Nothing about Lawrence 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

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

More on how this number was built

Lawrence 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.