Blount County, AL: EPA's radon zone, explained

EPA places Blount County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Blount County sits at the 56th percentile nationally for radon potential — above 56 of every 100 rated counties.

How Blount County compares

Blount County, Alabama is home to about 60,163 people across 644.905 square miles. Population density there runs about 93 people per square mile. By population, Blount County is the 306th largest of every county sharing its EPA zone — the 70th percentile by population within that zone. EPA's geology-based Region 4 groups Blount County with 735 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

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

Next steps for a home in Blount County

For a Blount County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Alabama's state radon program

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

Where Blount 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. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.