Radon in ZIP code 78140
Last updated
ZIP 78140 crosses 4 county lines. Most of its land (67.6%) is in Gonzales County, Texas. EPA’s radon zone for this area: Zone 3, low potential.
Predicted average indoor screening level below 2 pCi/L.
Predicted average indoor screening level below 2 pCi/L.
Predicted average indoor screening level below 2 pCi/L.
Predicted average indoor screening level below 2 pCi/L.
What this means for homes in 78140
EPA built its zone map county by county in 1993, so every address in each part of 78140 shares its county’s prediction. The zone is a starting point, not a measurement of your house. A Zone 3 prediction is the lowest, but EPA still finds homes above the action level in these areas.
Because 78140 crosses county lines, your county depends on your street. Your property tax bill or county assessor site shows which county you are in. Next: read how to test your home, then check the number with the level calculator.
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Nearby ZIP codes in Gonzales County
Texas radon help
TX Department of State Health Services, Radon Program (806-834-6202) can help with test kits, local data and credentialed professionals: www.depts.ttu.edu/ceweb/radon.
Frequently asked questions
What is the radon zone for ZIP code 78140?
ZIP 78140 spans 4 counties. The highest-potential zone among them is Zone 3 (low potential). Gonzales County: Zone 3 (67.6% of the ZIP's land); Wilson County: Zone 3 (27.2% of the ZIP's land); Guadalupe County: Zone 3 (3.3% of the ZIP's land); Karnes County: Zone 3 (1.9% of the ZIP's land).
Should I test for radon in 78140?
Yes. EPA recommends testing every home regardless of zone, because radon varies from house to house. Fix the home if a confirmed result is 4 pCi/L or higher, and consider fixing between 2 and 4 pCi/L.
Free checklist · PDF
Radon Test Checklist
A one-page, step-by-step checklist for running a home radon test right the first time, and what to do with the number.
- Short-term vs. long-term test: which to use
- Closed-house conditions and where to place the kit
- What 2, 4 and 8 pCi/L mean and when to fix
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