Do I Need Radon Testing in Georgia? What Dunwoody Homeowners Should Know

If you're buying a home in Dunwoody or anywhere in Metro Atlanta, your inspection checklist probably includes the roof, the foundation, and the HVAC. But there's one test many buyers skip — and it's for a hazard you can't see, smell, or taste. Here's what every Georgia homeowner and homebuyer should know about radon testing.

Questions about radon or your upcoming inspection? Call Kobalt Inspections at 770-800-1032 — we're happy to talk it through.

What is radon, and why should Georgia homeowners care?

Radon is a naturally occurring radioactive gas released as uranium breaks down in soil and rock. It seeps up through the ground and enters homes through cracks in foundations, gaps around pipes, crawl spaces, and basements. Outdoors it disperses harmlessly, but indoors it can accumulate to dangerous levels.

Here's why it matters: radon is the leading cause of lung cancer among nonsmokers in the United States, responsible for roughly 21,000 deaths per year nationally. In Georgia, radon exposure is linked to more than 800 deaths each year. Because the gas is completely invisible and odorless, the only way to know your home's level is to test for it.

Is Dunwoody in a radon risk zone?

Yes — and this surprises a lot of people. The EPA classifies four Georgia counties as Zone 1, meaning they have the highest radon potential, with predicted average indoor levels above the EPA's action level of 4 picocuries per liter (pCi/L). Those counties are Fulton, Cobb, DeKalb, and Gwinnett — essentially all of Metro Atlanta, including Dunwoody.

According to University of Georgia radon educators, the average indoor radon level is 1.3 pCi/L. Nationally, about one in every 15 homes has a high radon level. In north Georgia, that figure jumps to roughly one in five homes. Radon has been found at elevated levels in every region of Georgia, which is why the EPA's position is simple: all homes should be tested, regardless of where they're located.

Should you test when buying a home?

Absolutely. A real estate transaction is the single best time to test for radon. Georgia's due diligence period lets buyers evaluate the property and walk away if they don't like what they find — and a radon test fits naturally alongside your general home inspection. The test takes a minimum of 48 hours, so schedule it within the first day or two of due diligence, the same window as your inspection.

Even if you're not buying, testing is worth it if you've never tested your current home, if you've finished a basement, or if it's simply been a few years. Radon levels can change as homes settle and soil shifts.

How does radon testing work?

Professional radon testing is straightforward and non-invasive. A certified inspector places a test device — typically a continuous radon monitor — on the lowest lived-in level of the home, away from drafts, exterior walls, and heat sources. The device samples the air for at least 48 hours under "closed-house conditions," meaning windows and exterior doors stay shut (normal coming and going is fine) for about 12 hours before and throughout the test. This ensures the reading reflects the home's real, everyday radon level.

DIY charcoal canister kits are available from UGA Extension offices and hardware stores, but a professional test with a calibrated continuous monitor gives you an hour-by-hour picture of radon levels and tamper-resistant documentation — which matters when the results are part of a real estate negotiation.

What do the results mean?

Radon is measured in picocuries per liter of air (pCi/L). Here's how the EPA says to read your number:

- Below 2 pCi/L: Low risk. No action needed, though periodic retesting is smart.

- 2 to 4 pCi/L: Moderate. The EPA recommends considering mitigation — your inspector can help you weigh the options.

- 4 pCi/L or higher: Action level. The EPA recommends installing a radon mitigation system.

Remember, results are never zero — the national indoor average is 1.3 pCi/L. The question isn't whether radon is present; it's whether the concentration is high enough to act on.

What if the test comes back high?

Don't panic, and don't walk away from a home you love over it. A high radon result is one of the most fixable problems in real estate. A standard mitigation system uses sub-slab depressurization: a contractor seals foundation gaps, installs a PVC pipe with an inline fan, and vents the gas safely above the roofline. Installation typically takes a single day.

In the Atlanta area, a mitigation system for a basement or slab home generally runs $1,200 to $2,500, with crawl space systems costing more. Most systems carry a warranty and include a post-installation test confirming levels dropped below 4 pCi/L. During due diligence, buyers commonly negotiate a seller credit or ask the seller to install the system before closing.

The bottom line

Dunwoody sits in one of Georgia's highest radon-potential counties, radon causes real harm that only testing can reveal, and testing during a home purchase is cheap insurance. Add a radon test to your inspection order — it's a small step that protects your family for as long as you own the home.

Kobalt Inspections serves Dunwoody and all of Metro Atlanta with certified home inspections plus radon, mold, sewer, and infrared testing. Schedule your radon test alongside your home inspection by calling 770-800-1032 today.