What EPA's radon map says about Glynn County

EPA's own radon map rates Glynn County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. That puts Glynn County in the 25th percentile nationally for radon potential — higher than 25% of the counties EPA has rated.

Glynn County by the numbers

About 86,540 people live in Glynn County, Georgia, spread over 419.622 square miles. Population density there runs about 206 people per square mile. Among counties sharing Glynn County's EPA zone, it outranks 77% of them by population. EPA's geology-based Region 4 groups Glynn County with 735 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Glynn County

At Zone 3, Glynn 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 Glynn County testing above the action level often enough that skipping a test isn't the safe assumption.

Next steps for a home in Glynn County

Mitigation cost doesn't depend on Glynn 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

Glynn County's test kit answers today; a Airthings radon monitor keeps answering for Glynn 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 Glynn County's numbers. Whatever zone Glynn County carries, the zone explainer covers what it does and doesn't tell you about any one house.