What EPA's radon map says about Pecos County

EPA places Pecos 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. Rank it against the rest of the country and Pecos County lands in the 10th percentile for radon potential.

Where Pecos County sits nationally

About 14,712 people live in Pecos County, Texas, spread over 4,763.835 square miles. Population density there runs about 3 people per square mile. Among counties sharing Pecos County's EPA zone, it outranks 31% of them by population. Geologically, Pecos County is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

Zone vs. an actual test

At Zone 3, Pecos County's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. A Zone 3 rating means Pecos County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

Next steps for a home in Pecos County

Mitigation cost doesn't depend on Pecos 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

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

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. Whatever zone Pecos County carries, the zone explainer covers what it does and doesn't tell you about any one house.