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

EPA places Poinsett 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. That puts Poinsett County in the 15th percentile nationally for radon potential — higher than 15% of the counties EPA has rated.

Where Poinsett County sits nationally

Poinsett County, Arkansas is home to about 22,300 people across 758.295 square miles. Averaged across its land area, Poinsett County runs about 29 people per square mile. By population, Poinsett County is the 571st largest of every county sharing its EPA zone — the 45th percentile by population within that zone. Poinsett 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

Poinsett County's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. Don't read Zone 3 as a pass for Poinsett County — EPA's guidance to test every home makes no exception for counties predicted low.

Next steps for a home in Poinsett County

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

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