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

EPA's own radon map rates Benton County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. That puts Benton County in the 64th percentile nationally for radon potential — higher than 64% of the counties EPA has rated.

How Benton County compares

Benton County, Arkansas is home to about 321,566 people across 847.74 square miles. Averaged across its land area, Benton County runs about 379 people per square mile. By population, Benton County is the 72nd largest of every county sharing its EPA zone — the 93rd percentile by population within that zone. Geologically, Benton County is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

EPA's Zone 2 rating for Benton County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. A county-wide moderate average, like Benton County's, can still hide a specific house well above or below it — testing is what actually answers the question.

Next steps for a home in Benton County

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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Benton County carries, the zone explainer covers what it does and doesn't tell you about any one house.