Harris County, GA radon potential

EPA's own radon map rates Harris County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. That puts Harris County in the 52nd percentile nationally for radon potential — higher than 52% of the counties EPA has rated.

Harris County by the numbers

Harris County, Georgia is home to about 36,929 people across 463.825 square miles. Population density there runs about 80 people per square mile. Within its own EPA zone, Harris County is bigger by population than 59% of the counties that share it. Harris County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Harris County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). Middle-of-the-pack doesn't mean risk-free for any one Harris County address — a moderate county average still leaves individual homes to test either side of it.

Next steps for a home in Harris 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 Harris County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Harris County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

Where Harris County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Harris County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.