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

EPA places Irion 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. Nationally, Irion County ranks higher in radon potential than 1% of rated counties (the 1st percentile).

How Irion County compares

Irion County, Texas is home to about 1,526 people across 1,051.544 square miles. That works out to roughly 1 people per square mile. By population, Irion County is the 1001st largest of every county sharing its EPA zone — the 3rd percentile by population within that zone. Irion County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Irion County

Irion County's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. Even at Zone 3, Irion County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

Next steps for a home in Irion County

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

Irion County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.