Is Lavaca County, TX a radon risk area?

EPA places Lavaca County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Rank it against the rest of the country and Lavaca County lands in the 14th percentile for radon potential.

Where Lavaca County sits nationally

About 20,605 people live in Lavaca County, Texas, spread over 969.709 square miles. That works out to roughly 21 people per square mile. Rank 603 by population within its EPA zone puts Lavaca County at the 42nd percentile among zone peers. EPA's geology-based Region 6 groups Lavaca County with 502 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

At Zone 3, Lavaca 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. Don't read Zone 3 as a pass for Lavaca County — EPA's guidance to test every home makes no exception for counties predicted low.

Testing and mitigation in Lavaca County

Nothing about Lavaca County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Texas's state radon program

Lavaca County's test kit answers today; a Airthings radon monitor keeps answering for Lavaca County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

More on how this number was built

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