Cumberland County, TN radon potential

EPA places Cumberland 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. Nationally, Cumberland County ranks higher in radon potential than 24% of rated counties (the 24th percentile).

How Cumberland County compares

Cumberland County, Tennessee is home to about 65,618 people across 681.309 square miles. Averaged across its land area, Cumberland County runs about 96 people per square mile. Within its own EPA zone, Cumberland County is bigger by population than 72% of the counties that share it. Geologically, Cumberland 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

A Zone 3 county like Cumberland County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Don't read Zone 3 as a pass for Cumberland County — EPA's guidance to test every home makes no exception for counties predicted low.

Next steps for a home in Cumberland 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 Cumberland County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Cumberland 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 Cumberland County's figures come from

Cumberland 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.