Radon in Metro Atlanta: Testing, Mitigation, and What to Expect

Metro Atlanta is one of the largest housing markets in the Southeast, and radon is a real — if often overlooked — consideration for the region's homeowners. The Atlanta metro sits primarily in EPA Zone 2, meaning moderate predicted indoor radon levels. But "moderate" doesn't mean "safe," and many individual homes across the metro test above the EPA's 4.0 pCi/L action level.

Why the Northern Atlanta Suburbs Test Higher

The Atlanta metro sprawls across a wide geographic and geologic range. The city center and southern suburbs sit on Piedmont-region soils with moderate radon potential. But as you move north toward the Appalachian foothills — through Roswell, Alpharetta, Marietta, Kennesaw, and Woodstock — the geology shifts toward the same uranium-bearing formations that produce Zone 1 readings in north Georgia.

This gradient matters. A home in Atlanta proper may test at 2.5 pCi/L, while a similar home in Roswell or Alpharetta could read 6.0 or higher. You can't predict your home's radon level from your neighbor's results — foundation type, soil permeability, and construction details all influence the reading.

Testing Your Atlanta-Area Home

Two approaches work well for metro Atlanta homeowners:

Professional Continuous Monitor Testing

A certified radon professional places a tamper-evident continuous radon monitor (CRM) in your home for 48 hours. The device records hourly readings, producing a detailed exposure profile. This is the standard for real estate transactions and costs $150–$300 in the Atlanta market.

Metro Atlanta has about 20 certified radon professionals, with the heaviest concentration in Fulton, Cobb, and DeKalb counties. Browse all Georgia radon contractors to find testers near your neighborhood.

DIY Test Kits

Charcoal canister kits ($15–$40) are available at Atlanta-area hardware stores and work well as a screening tool. Place the kit in the lowest livable level, maintain closed-house conditions for 2–7 days, and mail it to a lab. Results come back in about two weeks.

If your DIY test comes back above 4.0 pCi/L, follow up with a professional test before committing to mitigation — it provides more granular data and is more defensible if you're also selling or refinancing.

Mitigation for Atlanta-Area Homes

Most metro Atlanta homes are built on slab-on-grade or crawl space foundations — full basements are less common here than in northern states. The mitigation approach depends on your foundation:

• Slab foundations: Sub-slab depressurization (SSD) is the standard approach. A contractor drills through the slab, installs PVC piping, and uses a fan to vent radon above the roofline. Most Atlanta-area slab installations cost $800–$1,500.
• Crawl space foundations: Sub-membrane depressurization involves sealing a heavy-duty polyethylene sheet over the crawl space floor and pulling suction beneath it. This is common in older Atlanta neighborhoods and in the suburbs with pier-and-beam construction. Cost typically runs $1,200–$2,200.
• Combination foundations: Some Atlanta homes have both a slab section and a crawl space. These may need multiple suction points. Get quotes from contractors experienced with combination foundations.

Estimate your cost with the radon mitigation cost calculator.

Real Estate and Radon in Metro Atlanta

Georgia does not legally require radon testing during home sales. But the practice is growing, especially in the northern suburbs where agents and buyers are increasingly aware of the elevated risk. In areas like Marietta, Kennesaw, and Woodstock, radon testing is becoming a routine part of the inspection process.

If you're buying a home in metro Atlanta, adding a radon test to your inspection contingency costs relatively little and provides valuable information. If levels come back elevated, mitigation is a straightforward negotiation point — the cost is modest compared to the overall transaction.

Where to Go From Here

Whether you're testing a current home or evaluating a purchase, metro Atlanta has solid contractor coverage for both testing and mitigation. Start with the radon assessment tool for personalized guidance, or search for radon testing near you. You can also browse all contractors in the Atlanta metro directory to compare credentials, ratings, and service areas across the region.