Waller County, TX radon potential

EPA's own radon map rates Waller 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 Waller County lands in the 24th percentile for radon potential.

How Waller County compares

Waller County, Texas is home to about 65,109 people across 513.344 square miles. Population density there runs about 127 people per square mile. Within its own EPA zone, Waller County is bigger by population than 72% of the counties that share it. Geologically, Waller County is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

Zone vs. an actual test

Waller 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 Waller County — EPA's guidance to test every home makes no exception for counties predicted low.

Next steps for a home in Waller 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 Waller County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Waller 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 Waller County's figures come from

Waller County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Waller County carries, the zone explainer covers what it does and doesn't tell you about any one house.