Is Colbert County, AL a radon risk area?

EPA's own radon map rates Colbert County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Rank it against the rest of the country and Colbert County lands in the 91st percentile for radon potential.

Where Colbert County sits nationally

About 58,785 people live in Colbert County, Alabama, spread over 592.953 square miles. That works out to roughly 99 people per square mile. Rank 281 by population within its EPA zone puts Colbert County at the 74th percentile among zone peers. EPA's geology-based Region 4 groups Colbert County with 735 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Colbert County

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Colbert County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Colbert County specifically.

Next steps for a home in Colbert County

Nothing about Colbert 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

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

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