Radon Levels in Georgia: What Homeowners Need to Know

If you own a home in Georgia, radon gas is a risk you may not have thought much about — but you should. Georgia consistently ranks among the southeastern states with the highest radon concentrations, and the problem is more widespread than most homeowners realize.

Radon is a colorless, odorless, radioactive gas that forms naturally as uranium breaks down in soil and rock. It seeps into homes through foundation cracks, gaps around pipes, and crawl spaces — and once inside, it can accumulate to dangerous levels. The EPA estimates that radon causes approximately 21,000 lung cancer deaths in the United States every year, making it the second leading cause of lung cancer after smoking.

The EPA recommends taking action to reduce radon if your home tests at 4 picocuries per liter (pCi/L) or higher. The average indoor radon level in U.S. homes is about 1.3 pCi/L, and the average outdoor level is around 0.4 pCi/L.

Even levels between 2 and 4 pCi/L are worth addressing. The EPA notes that there is no known safe level of radon exposure — any amount carries some risk. Reducing your home's radon level, even if it's below 4 pCi/L, lowers your family's long-term risk.

The EPA divides the country into three radon zones based on predicted average indoor radon levels:

• Zone 1 (highest risk): Predicted average above 4 pCi/L
• Zone 2 (moderate risk): Predicted average between 2 and 4 pCi/L
• Zone 3 (lowest risk): Predicted average below 2 pCi/L

In Georgia, North Georgia counties — particularly those in the Blue Ridge and Piedmont regions — fall into Zone 1 and Zone 2. Counties including Cherokee, Pickens, Gilmer, Dawson, Forsyth, Hall, and Lumpkin have elevated radon potential due to the underlying granite and metamorphic rock geology.

That said, radon levels vary significantly from house to house, even within the same neighborhood. A home on one side of the street can test at 8 pCi/L while the house next door tests at 1 pCi/L. Geology, soil permeability, foundation type, and home construction all play a role.

The elevated radon risk in North Georgia is directly tied to the region's geology. The Appalachian Mountains and Piedmont Plateau are underlain by granite, gneiss, and other uranium-bearing rocks. As these rocks weather and decay over millions of years, they release radon gas into the surrounding soil.

Homes built on or near these rock formations — especially those with basements or slab-on-grade foundations — are at higher risk of radon intrusion. The gas follows the path of least resistance, moving through soil and entering homes through:

• Cracks in concrete floors and walls
• Gaps around service pipes and utility penetrations
• Construction joints
• Crawl space floors and walls
• Sump pits and floor drains

The only way to know your home's radon level is to test it. Radon testing is straightforward, affordable, and can be done in two ways:

Short-term test kits are available at hardware stores and online for $15–$30. You place the kit in the lowest livable area of your home (usually a basement or first floor) for 2–7 days, then mail it to a certified lab for analysis. Results typically arrive within a week.

Short-term tests are a good starting point, but they capture a snapshot in time. Radon levels fluctuate with weather, seasons, and ventilation patterns, so a single short-term test may not reflect your home's true average.

A certified radon measurement professional uses calibrated electronic monitors to conduct a more accurate test. Professional testing is especially recommended for:

• Real estate transactions (results are required by many lenders and buyers)
• Homes with previous high readings
• Homes in high-risk counties
• Any situation where you need certified, legally defensible results

At Georgia Radon Pros, our NRPP-certified technicians use continuous electronic monitors that record radon levels every hour throughout the test period. You receive a detailed report with your results, typically within 48 hours of test completion.

If your test results come back at 4 pCi/L or higher, don't panic — the problem is fixable. Radon mitigation systems are highly effective, often reducing indoor radon levels by 90% or more.

The most common mitigation method is sub-slab depressurization (SSD), which involves installing a pipe through the foundation floor and a fan that draws radon from beneath the slab and vents it safely outside. Most systems can be installed in a single day and require minimal maintenance.

After mitigation, a follow-up test confirms that levels have dropped to an acceptable range. Georgia Radon Pros provides post-mitigation testing as part of every installation to ensure your system is working correctly.

Radon exposure is cumulative — the longer you're exposed to elevated levels, the greater your risk. Testing your home takes just a few days and costs very little compared to the peace of mind it provides.

If you live in North Georgia or any of the counties we serve, we encourage you to schedule a professional radon test today. Our NRPP-certified team serves over 31 Georgia counties and 4 Upstate South Carolina counties, with results delivered in 48 hours.

Call us at (678) 662-1100 or contact us online to schedule your radon test. Protecting your family starts with knowing what's in your air.