What EPA's radon map says about Prentiss County

EPA places Prentiss 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. Prentiss County sits at the 16th percentile nationally for radon potential — above 16 of every 100 rated counties.

Prentiss County by the numbers

About 25,489 people live in Prentiss County, Mississippi, spread over 414.985 square miles. Averaged across its land area, Prentiss County runs about 61 people per square mile. Among counties sharing Prentiss County's EPA zone, it outranks 48% of them by population. Prentiss County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Prentiss 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. A Zone 3 rating means Prentiss 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.

Next steps for a home in Prentiss County

Mitigation cost doesn't depend on Prentiss 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

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