Blanco County, TX radon potential

Blanco County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Rank it against the rest of the country and Blanco County lands in the 9th percentile for radon potential.

Where Blanco County sits nationally

Blanco County, Texas is home to about 13,358 people across 709.252 square miles. Averaged across its land area, Blanco County runs about 19 people per square mile. Within its own EPA zone, Blanco County is bigger by population than 28% of the counties that share it. EPA's geology-based Region 6 groups Blanco County with 502 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Blanco County's Zone 3 prediction is the low end of the scale. Even at Zone 3, Blanco County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

Next steps for a home in Blanco 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 Blanco County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Blanco County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

Where Blanco County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Blanco County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.