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

EPA places Donley 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. Rank it against the rest of the country and Donley County lands in the 35th percentile for radon potential.

Donley County by the numbers

Donley County, Texas is home to about 3,193 people across 927.037 square miles. That works out to roughly 3 people per square mile. By population, Donley County is the 981st largest of every county sharing its EPA zone — the 5th percentile by population within that zone. Geologically, Donley 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 Donley County

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Donley County's Zone 2 prediction lands in the gap between the two. Nothing about a Zone 2 label lowers the case for testing in Donley County — EPA recommends it in every zone, moderate included.

Next steps for a home in Donley County

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

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