Attala County, MS: EPA's radon zone, explained

EPA's own radon map rates Attala County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally that's the 11th percentile for radon potential — Attala County outranks 11% of every county EPA has rated.

Where Attala County sits nationally

Attala County, Mississippi is home to about 17,222 people across 734.957 square miles. Averaged across its land area, Attala County runs about 23 people per square mile. By population, Attala County is the 675th largest of every county sharing its EPA zone — the 35th percentile by population within that zone. EPA's geology-based Region 4 groups Attala County with 735 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Attala County

Attala 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. A Zone 3 rating means Attala County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

If Attala County tests above the action level

For a Attala 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 Mississippi's state radon program

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

Where Attala County's figures come from

Attala County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.