What EPA's radon map says about Polk County

Polk County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally that's the 21st percentile for radon potential — Polk County outranks 21% of every county EPA has rated.

Polk County by the numbers

About 44,610 people live in Polk County, Georgia, spread over 310.34 square miles. That works out to roughly 144 people per square mile. Among counties sharing Polk County's EPA zone, it outranks 64% of them by population. Polk County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

At Zone 3, Polk County's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Polk County testing above the action level often enough that skipping a test isn't the safe assumption.

Next steps for a home in Polk County

Mitigation cost doesn't depend on Polk 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 Georgia's state radon program

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

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