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

EPA's own radon map rates Bibb County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Rank it against the rest of the country and Bibb County lands in the 28th percentile for radon potential.

Where Bibb County sits nationally

Bibb County, Georgia is home to about 157,056 people across 249.383 square miles. Population density there runs about 630 people per square mile. By population, Bibb County is the 163rd largest of every county sharing its EPA zone — the 84th percentile by population within that zone. Geologically, Bibb County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

What this actually means for a house in Bibb County

At Zone 3, Bibb 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. Don't read Zone 3 as a pass for Bibb County — EPA's guidance to test every home makes no exception for counties predicted low.

If Bibb County tests above the action level

For a Bibb 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 Bibb County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Bibb County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

Where Bibb 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 Bibb County carries, the zone explainer covers what it does and doesn't tell you about any one house.