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

Telfair County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Telfair County sits at the 8th percentile nationally for radon potential — above 8 of every 100 rated counties.

Telfair County by the numbers

Telfair County, Georgia is home to about 11,000 people across 437.307 square miles. Population density there runs about 25 people per square mile. By population, Telfair County is the 795th largest of every county sharing its EPA zone — the 23rd percentile by population within that zone. Geologically, Telfair County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

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

If Telfair County tests above the action level

For a Telfair 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 Telfair County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Telfair 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 Telfair 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. Whatever zone Telfair County carries, the zone explainer covers what it does and doesn't tell you about any one house.