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

EPA's own radon map rates Tishomingo County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally that's the 12th percentile for radon potential — Tishomingo County outranks 12% of every county EPA has rated.

Tishomingo County by the numbers

Tishomingo County, Mississippi is home to about 18,553 people across 424.297 square miles. That works out to roughly 44 people per square mile. By population, Tishomingo County is the 651st largest of every county sharing its EPA zone — the 37th percentile by population within that zone. Tishomingo County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Tishomingo County

Tishomingo 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. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Tishomingo County testing above the action level often enough that skipping a test isn't the safe assumption.

Next steps for a home in Tishomingo County

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

Where Tishomingo County's figures come from

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