Sebastian County, AR radon potential

EPA's own radon map rates Sebastian County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Rank it against the rest of the country and Sebastian County lands in the 27th percentile for radon potential.

Where Sebastian County sits nationally

Sebastian County, Arkansas is home to about 130,035 people across 531.184 square miles. That works out to roughly 245 people per square mile. Within its own EPA zone, Sebastian County is bigger by population than 82% of the counties that share it. Sebastian 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 Sebastian County

A Zone 3 county like Sebastian County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. A Zone 3 label describes Sebastian County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

Testing and mitigation in Sebastian County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Arkansas's state radon program

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

Where Sebastian County's figures come from

Sebastian County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Sebastian County carries, the zone explainer covers what it does and doesn't tell you about any one house.