What EPA's radon map says about Coosa County

EPA's own radon map rates Coosa County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Coosa County sits at the 76th percentile nationally for radon potential — above 76 of every 100 rated counties.

Coosa County by the numbers

About 10,291 people live in Coosa County, Alabama, spread over 650.909 square miles. Population density there runs about 16 people per square mile. Among counties sharing Coosa County's EPA zone, it outranks 29% of them by population. Coosa County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Coosa County

Where the national indoor average runs about 1.3 pCi/L, Coosa County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. 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 Coosa County specifically.

If Coosa County tests above the action level

Mitigation cost doesn't depend on Coosa 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

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

The methodology guide shows exactly which EPA and Census sources feed Coosa County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.