White County, TN: EPA's radon zone, explained

EPA's own radon map rates White County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally that's the 50th percentile for radon potential — White County outranks 50% of every county EPA has rated.

Where White County sits nationally

White County, Tennessee is home to about 29,108 people across 376.678 square miles. That works out to roughly 77 people per square mile. By population, White County is the 493rd largest of every county sharing its EPA zone — the 52nd percentile by population within that zone. EPA's geology-based Region 4 groups White County with 735 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

EPA's Zone 2 rating for White County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. White 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 White County

For a White County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Tennessee's state radon program

For White County, an ongoing number beats a one-time test - a Airthings radon monitor tracks White County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

Where White County's figures come from

White County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.