What EPA's radon map says about Leake County

EPA places Leake County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Leake County sits at the 14th percentile nationally for radon potential — above 14 of every 100 rated counties.

Leake County by the numbers

About 21,462 people live in Leake County, Mississippi, spread over 582.897 square miles. Population density there runs about 37 people per square mile. Among counties sharing Leake County's EPA zone, it outranks 43% of them by population. Leake 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 Leake County

At Zone 3, Leake County's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. A Zone 3 rating means Leake 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.

If Leake County tests above the action level

Mitigation cost doesn't depend on Leake 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

Leake County's test kit answers today; a Airthings radon monitor keeps answering for Leake 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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.