What EPA's radon map says about White County

White County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. White County sits at the 25th percentile nationally for radon potential — above 25 of every 100 rated counties.

White County by the numbers

About 79,091 people live in White County, Arkansas, spread over 1,033.966 square miles. That works out to roughly 76 people per square mile. Among counties sharing White County's EPA zone, it outranks 76% of them by population. EPA's geology-based Region 6 groups White County with 502 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

A Zone 3 county like White 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 White County — EPA's guidance to test every home makes no exception for counties predicted low.

Next steps for a home in White County

Mitigation cost doesn't depend on White County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Arkansas's state radon program

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

White 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.