Is Lampasas County, TX a radon risk area?

EPA places Lampasas 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. That puts Lampasas County in the 15th percentile nationally for radon potential — higher than 15% of the counties EPA has rated.

Lampasas County by the numbers

About 23,539 people live in Lampasas County, Texas, spread over 712.528 square miles. Averaged across its land area, Lampasas County runs about 33 people per square mile. Rank 555 by population within its EPA zone puts Lampasas County at the 46th percentile among zone peers. Geologically, Lampasas County is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

What this actually means for a house in Lampasas County

A Zone 3 county like Lampasas County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Lampasas County testing above the action level often enough that skipping a test isn't the safe assumption.

Testing and mitigation in Lampasas County

Nothing about Lampasas 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

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

More on how this number was built

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.