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

Ashley County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Ashley County sits at the 12th percentile nationally for radon potential — above 12 of every 100 rated counties.

Ashley County by the numbers

Ashley County, Arkansas is home to about 17,984 people across 925.492 square miles. That works out to roughly 19 people per square mile. By population, Ashley County is the 664th largest of every county sharing its EPA zone — the 36th percentile by population within that zone. Geologically, Ashley County is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

What this actually means for a house in Ashley County

Ashley County's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. A Zone 3 rating means Ashley County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

Testing and mitigation in Ashley County

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

Where Ashley County's figures come from

Ashley 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.