Lanier County, GA: EPA's radon zone, explained

EPA places Lanier County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. That puts Lanier County in the 7th percentile nationally for radon potential — higher than 7% of the counties EPA has rated.

How Lanier County compares

Lanier County, Georgia is home to about 10,464 people across 196.537 square miles. Population density there runs about 53 people per square mile. By population, Lanier County is the 809th largest of every county sharing its EPA zone — the 22nd percentile by population within that zone. EPA's geology-based Region 4 groups Lanier County with 735 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

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

Next steps for a home in Lanier County

For a Lanier 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 Georgia's state radon program

For Lanier County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Lanier 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 Lanier County's figures come from

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