Is Winston County, MS a radon risk area?

Winston County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally, Winston County ranks higher in radon potential than 11% of rated counties (the 11th percentile).

Winston County by the numbers

About 17,418 people live in Winston County, Mississippi, spread over 607.251 square miles. Population density there runs about 29 people per square mile. Rank 674 by population within its EPA zone puts Winston County at the 35th percentile among zone peers. EPA's geology-based Region 4 groups Winston County with 735 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

A Zone 3 county like Winston County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. A Zone 3 label describes Winston County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

Next steps for a home in Winston County

Nothing about Winston 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

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

More on how this number was built

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