Hamblen County, TN radon potential

EPA places Hamblen 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. Hamblen County sits at the 92nd percentile nationally for radon potential — above 92 of every 100 rated counties.

How Hamblen County compares

Hamblen County, Tennessee is home to about 67,715 people across 161.188 square miles. Averaged across its land area, Hamblen County runs about 420 people per square mile. Within its own EPA zone, Hamblen County is bigger by population than 77% of the counties that share it. Geologically, Hamblen County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

What this actually means for a house in Hamblen County

Hamblen County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. 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 Hamblen County will test well under the action level, and EPA's guidance is to test regardless of zone.

Testing and mitigation in Hamblen County

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 Hamblen County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Hamblen 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 Hamblen 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. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.