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

Cross County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Rank it against the rest of the country and Cross County lands in the 11th percentile for radon potential.

Where Cross County sits nationally

Cross County, Arkansas is home to about 16,194 people across 616.318 square miles. Averaged across its land area, Cross County runs about 26 people per square mile. By population, Cross County is the 687th largest of every county sharing its EPA zone — the 33rd percentile by population within that zone. Cross County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

A Zone 3 county like Cross 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 Cross County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

Next steps for a home in Cross County

For a Cross 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 Cross County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Cross 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 Cross 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. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.