Bandera County, TX: EPA's radon zone, explained

Bandera County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Bandera County sits at the 15th percentile nationally for radon potential — above 15 of every 100 rated counties.

Where Bandera County sits nationally

Bandera County, Texas is home to about 22,830 people across 790.994 square miles. Population density there runs about 29 people per square mile. By population, Bandera County is the 565th largest of every county sharing its EPA zone — the 45th percentile by population within that zone. Bandera County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Bandera County

Bandera 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. Don't read Zone 3 as a pass for Bandera County — EPA's guidance to test every home makes no exception for counties predicted low.

If Bandera County tests above the action level

For a Bandera County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Texas's state radon program

For Bandera County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Bandera County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

Where Bandera County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Bandera County's numbers. Whatever zone Bandera County carries, the zone explainer covers what it does and doesn't tell you about any one house.