Gonzales County, TX radon potential

EPA's own radon map rates Gonzales County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally that's the 13th percentile for radon potential — Gonzales County outranks 13% of every county EPA has rated.

How Gonzales County compares

Gonzales County, Texas is home to about 20,040 people across 1,066.686 square miles. Averaged across its land area, Gonzales County runs about 19 people per square mile. Within its own EPA zone, Gonzales County is bigger by population than 40% of the counties that share it. Gonzales County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

At Zone 3, Gonzales County's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. A Zone 3 rating means Gonzales 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.

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

Gonzales County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.