Is Weakley County, TN a radon risk area?

EPA places Weakley 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. Rank it against the rest of the country and Weakley County lands in the 18th percentile for radon potential.

Where Weakley County sits nationally

About 33,162 people live in Weakley County, Tennessee, spread over 580.353 square miles. Averaged across its land area, Weakley County runs about 57 people per square mile. Rank 455 by population within its EPA zone puts Weakley County at the 56th percentile among zone peers. Geologically, Weakley 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, Weakley 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 Weakley 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 Weakley County

Nothing about Weakley 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 Tennessee's state radon program

Weakley County's test kit answers today; a Airthings radon monitor keeps answering for Weakley County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Weakley County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.