What EPA's radon map says about Stone County

EPA's own radon map rates Stone County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally, Stone County ranks higher in radon potential than 41% of rated counties (the 41st percentile).

Where Stone County sits nationally

About 12,785 people live in Stone County, Arkansas, spread over 606.44 square miles. Averaged across its land area, Stone County runs about 21 people per square mile. Among counties sharing Stone County's EPA zone, it outranks 26% of them by population. Stone County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Stone County

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Stone County's Zone 2 prediction lands in the gap between the two. Nothing about a Zone 2 label lowers the case for testing in Stone County — EPA recommends it in every zone, moderate included.

If Stone County tests above the action level

Mitigation cost doesn't depend on Stone 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

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

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Stone County's numbers. Whatever zone Stone County carries, the zone explainer covers what it does and doesn't tell you about any one house.