Franklin County, TX radon potential

Franklin County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Franklin County sits at the 7th percentile nationally for radon potential — above 7 of every 100 rated counties.

How Franklin County compares

Franklin County, Texas is home to about 10,912 people across 284.403 square miles. That works out to roughly 38 people per square mile. Within its own EPA zone, Franklin County is bigger by population than 23% of the counties that share it. EPA's geology-based Region 6 groups Franklin County with 502 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Franklin County

Franklin County's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. A Zone 3 rating means Franklin County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

Testing and mitigation in Franklin 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 Franklin County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Franklin 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 Franklin 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. Whatever zone Franklin County carries, the zone explainer covers what it does and doesn't tell you about any one house.