Is Kemper County, MS a radon risk area?

EPA places Kemper 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. Nationally that's the 5th percentile for radon potential — Kemper County outranks 5% of every county EPA has rated.

Where Kemper County sits nationally

About 8,562 people live in Kemper County, Mississippi, spread over 766.182 square miles. Population density there runs about 11 people per square mile. Rank 863 by population within its EPA zone puts Kemper County at the 16th percentile among zone peers. Geologically, Kemper County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

At Zone 3, Kemper 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. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Kemper County testing above the action level often enough that skipping a test isn't the safe assumption.

Testing and mitigation in Kemper County

Nothing about Kemper 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

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