Is Graves County, KY a radon risk area?

EPA places Graves 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, Graves County ranks higher in radon potential than 19% of rated counties (the 19th percentile).

Where Graves County sits nationally

About 36,821 people live in Graves County, Kentucky, spread over 551.757 square miles. Population density there runs about 67 people per square mile. Rank 426 by population within its EPA zone puts Graves County at the 59th percentile among zone peers. Geologically, Graves 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

A Zone 3 county like Graves County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Even at Zone 3, Graves County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

Next steps for a home in Graves County

Nothing about Graves 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 Kentucky's state radon program

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