Sevier County, AR Radon Zone Data

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

EPA places Sevier 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. Sevier County sits at the 11th percentile nationally for radon potential — above 11 of every 100 rated counties.

Where Sevier County sits nationally

Sevier County, Arkansas is home to about 15,735 people across 563.569 square miles. Averaged across its land area, Sevier County runs about 28 people per square mile. By population, Sevier County is the 699th largest of every county sharing its EPA zone — the 32nd percentile by population within that zone. EPA's geology-based Region 6 groups Sevier County with 502 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Sevier County

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Sevier County's Zone 3 prediction is the low end of the scale. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Sevier County testing above the action level often enough that skipping a test isn't the safe assumption.

If Sevier County tests above the action level

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

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