Lonoke County, AR: EPA's radon zone, explained

EPA's own radon map rates Lonoke County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally, Lonoke County ranks higher in radon potential than 25% of rated counties (the 25th percentile).

How Lonoke County compares

Lonoke County, Arkansas is home to about 76,389 people across 771.723 square miles. Averaged across its land area, Lonoke County runs about 99 people per square mile. By population, Lonoke County is the 258th largest of every county sharing its EPA zone — the 75th percentile by population within that zone. EPA's geology-based Region 6 groups Lonoke County with 502 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

A Zone 3 county like Lonoke County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Even at Zone 3, Lonoke County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

Testing and mitigation in Lonoke County

For a Lonoke County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Arkansas's state radon program

For Lonoke County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Lonoke County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

Where Lonoke County's figures come from

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