Dallas County, TX radon potential

EPA's own radon map rates Dallas County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally, Dallas County ranks higher in radon potential than 33% of rated counties (the 33rd percentile).

Dallas County by the numbers

Dallas County, Texas is home to about 2,656,028 people across 873.188 square miles. Population density there runs about 3,042 people per square mile. Within its own EPA zone, Dallas County is bigger by population than 100% of the counties that share it. Geologically, Dallas 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 Dallas County

Dallas County's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. Don't read Zone 3 as a pass for Dallas County — EPA's guidance to test every home makes no exception for counties predicted low.

Testing and mitigation in Dallas 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 Dallas County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Dallas 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 Dallas 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. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.