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

EPA places Faulkner County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Faulkner County sits at the 27th percentile nationally for radon potential — above 27 of every 100 rated counties.

Faulkner County by the numbers

Faulkner County, Arkansas is home to about 131,611 people across 647.247 square miles. That works out to roughly 203 people per square mile. By population, Faulkner County is the 185th largest of every county sharing its EPA zone — the 82nd percentile by population within that zone. Faulkner County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Faulkner 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 label describes Faulkner County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

If Faulkner County tests above the action level

For a Faulkner 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 Faulkner County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Faulkner 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 Faulkner County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Faulkner County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.