What EPA's radon map says about DeKalb County

DeKalb 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. DeKalb County sits at the 58th percentile nationally for radon potential — above 58 of every 100 rated counties.

DeKalb County by the numbers

About 73,122 people live in DeKalb County, Alabama, spread over 777.077 square miles. Population density there runs about 94 people per square mile. Among counties sharing DeKalb County's EPA zone, it outranks 76% of them by population. DeKalb County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

EPA's Zone 2 rating for DeKalb County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. A county-wide moderate average, like DeKalb County's, can still hide a specific house well above or below it — testing is what actually answers the question.

Next steps for a home in DeKalb County

Mitigation cost doesn't depend on DeKalb County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Alabama's state radon program

DeKalb County's test kit answers today; a Airthings radon monitor keeps answering for DeKalb 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

DeKalb County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.