Is Houston County, TN a radon risk area?

EPA's own radon map rates Houston County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Rank it against the rest of the country and Houston County lands in the 39th percentile for radon potential.

Houston County by the numbers

About 8,538 people live in Houston County, Tennessee, spread over 200.294 square miles. Population density there runs about 43 people per square mile. Rank 852 by population within its EPA zone puts Houston County at the 17th percentile among zone peers. EPA's geology-based Region 4 groups Houston County with 735 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Houston County's Zone 2 prediction lands in the gap between the two. Houston County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

Testing and mitigation in Houston County

Nothing about Houston 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

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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.