Is Dallas County, AL a radon risk area?

Dallas County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. Rank it against the rest of the country and Dallas County lands in the 52nd percentile for radon potential.

Dallas County by the numbers

About 35,545 people live in Dallas County, Alabama, spread over 978.741 square miles. Population density there runs about 36 people per square mile. Rank 438 by population within its EPA zone puts Dallas County at the 58th percentile among zone peers. Dallas County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

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

Testing and mitigation in Dallas County

Nothing about Dallas County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Alabama's state radon program

Dallas County's test kit answers today; a Airthings radon monitor keeps answering for Dallas 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. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.