What EPA's radon map says about Little River County

Little River County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally, Little River County ranks higher in radon potential than 8% of rated counties (the 8th percentile).

Where Little River County sits nationally

About 11,626 people live in Little River County, Arkansas, spread over 531.255 square miles. That works out to roughly 22 people per square mile. Among counties sharing Little River County's EPA zone, it outranks 24% of them by population. Geologically, Little River County is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

Zone vs. an actual test

At Zone 3, Little River County's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Little River County testing above the action level often enough that skipping a test isn't the safe assumption.

If Little River County tests above the action level

Mitigation cost doesn't depend on Little River 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

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

Little River County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.