Is Jefferson Davis County, MS a radon risk area?

EPA's own radon map rates Jefferson Davis County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally that's the 8th percentile for radon potential — Jefferson Davis County outranks 8% of every county EPA has rated.

How Jefferson Davis County compares

About 11,059 people live in Jefferson Davis County, Mississippi, spread over 408.446 square miles. Averaged across its land area, Jefferson Davis County runs about 27 people per square mile. Rank 792 by population within its EPA zone puts Jefferson Davis County at the 23rd percentile among zone peers. Geologically, Jefferson Davis County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Jefferson Davis 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 Jefferson Davis County testing above the action level often enough that skipping a test isn't the safe assumption.

If Jefferson Davis County tests above the action level

Nothing about Jefferson Davis 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

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

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Jefferson Davis County's numbers. Whatever zone Jefferson Davis County carries, the zone explainer covers what it does and doesn't tell you about any one house.