Presidio County, TX radon potential

EPA places Presidio 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 Presidio County lands in the 36th percentile for radon potential.

Presidio County by the numbers

Presidio County, Texas is home to about 5,686 people across 3,855.252 square miles. Averaged across its land area, Presidio County runs about 1 people per square mile. Within its own EPA zone, Presidio County is bigger by population than 10% of the counties that share it. EPA's geology-based Region 6 groups Presidio County with 502 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Presidio 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). A county-wide moderate average, like Presidio County's, can still hide a specific house well above or below it — testing is what actually answers the question.

Testing and mitigation in Presidio County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Texas's state radon program

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

Presidio 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.