Kendall County, TX radon potential

EPA's own radon map rates Kendall County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Rank it against the rest of the country and Kendall County lands in the 22nd percentile for radon potential.

Where Kendall County sits nationally

Kendall County, Texas is home to about 51,828 people across 662.454 square miles. Population density there runs about 78 people per square mile. Within its own EPA zone, Kendall County is bigger by population than 68% of the counties that share it. EPA's geology-based Region 6 groups Kendall County with 502 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Kendall 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. Even at Zone 3, Kendall County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

If Kendall County tests above the action level

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

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