Navarro County, TX radon potential

EPA's own radon map rates Navarro County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Navarro County sits at the 23rd percentile nationally for radon potential — above 23 of every 100 rated counties.

Where Navarro County sits nationally

Navarro County, Texas is home to about 56,533 people across 1,009.702 square miles. Population density there runs about 56 people per square mile. Within its own EPA zone, Navarro County is bigger by population than 70% of the counties that share it. EPA's geology-based Region 6 groups Navarro County with 502 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

At Zone 3, Navarro County's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. Don't read Zone 3 as a pass for Navarro County — EPA's guidance to test every home makes no exception for counties predicted low.

Testing and mitigation in Navarro 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 Texas's state radon program

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

The methodology guide shows exactly which EPA and Census sources feed Navarro County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.