Garza County, TX: EPA's radon zone, explained

EPA places Garza 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 that's the 36th percentile for radon potential — Garza County outranks 36% of every county EPA has rated.

How Garza County compares

Garza County, Texas is home to about 4,645 people across 893.416 square miles. That works out to roughly 5 people per square mile. By population, Garza County is the 951st largest of every county sharing its EPA zone — the 8th percentile by population within that zone. Garza County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Garza County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). Garza 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 Garza County

For a Garza County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Texas's state radon program

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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Garza County carries, the zone explainer covers what it does and doesn't tell you about any one house.