What EPA's radon map says about Wilkinson County

EPA places Wilkinson 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. Wilkinson County sits at the 5th percentile nationally for radon potential — above 5 of every 100 rated counties.

Where Wilkinson County sits nationally

About 7,820 people live in Wilkinson County, Mississippi, spread over 678.012 square miles. Averaged across its land area, Wilkinson County runs about 12 people per square mile. Among counties sharing Wilkinson County's EPA zone, it outranks 15% of them by population. Wilkinson County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Wilkinson County's Zone 3 prediction is the low end of the scale. Don't read Zone 3 as a pass for Wilkinson County — EPA's guidance to test every home makes no exception for counties predicted low.

If Wilkinson County tests above the action level

Mitigation cost doesn't depend on Wilkinson 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

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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Wilkinson County carries, the zone explainer covers what it does and doesn't tell you about any one house.