Is Tunica County, MS a radon risk area?

EPA's own radon map rates Tunica County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally, Tunica County ranks higher in radon potential than 6% of rated counties (the 6th percentile).

Where Tunica County sits nationally

About 9,157 people live in Tunica County, Mississippi, spread over 454.13 square miles. That works out to roughly 20 people per square mile. Rank 845 by population within its EPA zone puts Tunica County at the 18th percentile among zone peers. EPA's geology-based Region 4 groups Tunica County with 735 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Tunica County

Tunica 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 Tunica 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.

Next steps for a home in Tunica County

Nothing about Tunica County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Mississippi's state radon program

Tunica County's test kit answers today; a Airthings radon monitor keeps answering for Tunica County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Tunica County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.