What EPA's radon map says about Lamb County

EPA places Lamb County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally, Lamb County ranks higher in radon potential than 41% of rated counties (the 41st percentile).

Where Lamb County sits nationally

About 12,687 people live in Lamb County, Texas, spread over 1,016.181 square miles. Population density there runs about 12 people per square mile. Among counties sharing Lamb County's EPA zone, it outranks 26% of them by population. Geologically, Lamb 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 Lamb County

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Lamb County's Zone 2 prediction lands in the gap between the two. Lamb County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

Testing and mitigation in Lamb County

Mitigation cost doesn't depend on Lamb County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Texas's state radon program

Lamb County's test kit answers today; a Airthings radon monitor keeps answering for Lamb 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

The methodology guide shows exactly which EPA and Census sources feed Lamb County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.