Hancock County, TN radon potential

EPA places Hancock County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Hancock County sits at the 73rd percentile nationally for radon potential — above 73 of every 100 rated counties.

Where Hancock County sits nationally

Hancock County, Tennessee is home to about 7,038 people across 222.324 square miles. That works out to roughly 32 people per square mile. Within its own EPA zone, Hancock County is bigger by population than 21% of the counties that share it. Geologically, Hancock County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

Zone vs. an actual test

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Hancock County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. A Zone 1 rating means testing is worth doing sooner rather than later, but it is still county-wide average, not a reading for any single house — some homes in Hancock County will test well under the action level, and EPA's guidance is to test regardless of zone.

If Hancock County tests above the action level

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Tennessee's state radon program

For Hancock County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Hancock 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 Hancock County's figures come from

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.