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

EPA places Saline 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. Nationally, Saline County ranks higher in radon potential than 27% of rated counties (the 27th percentile).

Where Saline County sits nationally

Saline County, Arkansas is home to about 131,252 people across 723.516 square miles. Population density there runs about 181 people per square mile. By population, Saline County is the 186th largest of every county sharing its EPA zone — the 82nd percentile by population within that zone. Saline 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 Saline County

At Zone 3, Saline County's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. Don't read Zone 3 as a pass for Saline County — EPA's guidance to test every home makes no exception for counties predicted low.

If Saline County tests above the action level

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

Where Saline County's figures come from

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