Aransas County, TX radon potential

EPA places Aransas 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. Aransas County sits at the 16th percentile nationally for radon potential — above 16 of every 100 rated counties.

How Aransas County compares

Aransas County, Texas is home to about 25,595 people across 252.271 square miles. Averaged across its land area, Aransas County runs about 101 people per square mile. Within its own EPA zone, Aransas County is bigger by population than 48% of the counties that share it. EPA's geology-based Region 6 groups Aransas County with 502 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Aransas County's Zone 3 prediction is the low end of the scale. A Zone 3 rating means Aransas 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.

If Aransas County tests above the action level

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 Aransas County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Aransas County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

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