Effingham County, GA radon potential

EPA places Effingham 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 Effingham County in the 25th percentile nationally for radon potential — higher than 25% of the counties EPA has rated.

Effingham County by the numbers

Effingham County, Georgia is home to about 73,148 people across 478.887 square miles. Averaged across its land area, Effingham County runs about 153 people per square mile. Within its own EPA zone, Effingham County is bigger by population than 75% of the counties that share it. Geologically, Effingham 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 Effingham County

Effingham County's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. A Zone 3 label describes Effingham County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

Testing and mitigation in Effingham County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Georgia's state radon program

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

Effingham County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.