What EPA's radon map says about DeSoto County

EPA's own radon map rates DeSoto County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. That puts DeSoto County in the 29th percentile nationally for radon potential — higher than 29% of the counties EPA has rated.

How DeSoto County compares

About 195,871 people live in DeSoto County, Mississippi, spread over 476.394 square miles. That works out to roughly 411 people per square mile. Among counties sharing DeSoto County's EPA zone, it outranks 87% of them by population. EPA's geology-based Region 4 groups DeSoto County with 735 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in DeSoto County

DeSoto County's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. Don't read Zone 3 as a pass for DeSoto County — EPA's guidance to test every home makes no exception for counties predicted low.

If DeSoto County tests above the action level

Mitigation cost doesn't depend on DeSoto County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Mississippi's state radon program

DeSoto County's test kit answers today; a Airthings radon monitor keeps answering for DeSoto 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 DeSoto County's numbers. Whatever zone DeSoto County carries, the zone explainer covers what it does and doesn't tell you about any one house.