Atlanta Radon Map
EPA Zones & County Radon Data
Most Metro Atlanta counties are in EPA Zone 1, the highest radon risk category. Testing is strongly recommended.
Understanding EPA Radon Zones
High radon potential. Predicted average indoor levels above 4 pCi/L. Testing is strongly recommended.
Moderate radon potential. Predicted average indoor levels between 2-4 pCi/L. Testing is recommended.
Low radon potential. Predicted average indoor levels below 2 pCi/L. Testing is still recommended.
Metro Atlanta County Zones
| County | EPA Zone | Risk Level | Includes |
|---|---|---|---|
| Fulton County | Zone 1 | High | Includes Atlanta, Sandy Springs, Alpharetta |
| DeKalb County | Zone 1 | High | Includes Decatur, Dunwoody, Brookhaven |
| Cobb County | Zone 1 | High | Includes Marietta, Smyrna, Kennesaw |
| Gwinnett County | Zone 1 | High | Includes Lawrenceville, Duluth, Suwanee |
| Cherokee County | Zone 1 | High | Includes Canton, Woodstock |
| Forsyth County | Zone 1 | High | Includes Cumming |
| Hall County | Zone 1 | High | Includes Gainesville |
| Clayton County | Zone 2 | Moderate | Includes Jonesboro |
Important Limitation
Radon zone maps show general regional trends but cannot predict individual home levels. Two homes on the same street can have very different radon levels. The only way to know your home's radon level is to test.
Radon Map FAQs
What do EPA radon zones mean?
EPA zones predict the average indoor radon screening potential. Zone 1 counties have the highest potential (above 4 pCi/L average), Zone 2 is moderate (2-4 pCi/L), and Zone 3 is low (below 2 pCi/L). These are predictions, individual home levels vary.
Why is most of Metro Atlanta in Zone 1?
Metro Atlanta sits on the Piedmont geological province, characterized by granite and other crystalline rocks that contain uranium. As uranium decays, it produces radon gas that can enter homes.
If my county is Zone 1, does my home have high radon?
Not necessarily. Zone classifications represent county averages, but individual homes vary widely. Some Zone 1 homes test below 2 pCi/L while others test above 10 pCi/L. Testing is the only way to know.
Are radon maps accurate predictors?
Radon maps provide general guidance about regional risk, but they cannot predict individual home levels. Factors like foundation type, construction, and local soil conditions significantly affect radon entry. Every home should be tested.
Where can I find EPA radon zone maps?
The EPA provides radon zone maps on their website at epa.gov/radon. State-level maps are available from Georgia Department of Public Health and other state agencies.
Does being in Zone 2 or 3 mean I don't need to test?
No. The EPA recommends all homes be tested regardless of zone classification. Even in lower-risk zones, individual homes can have elevated radon levels.
Test Your Home
Don't rely on maps alone. Contact us to discuss testing your home.
Related Topics
High Radon Areas
Learn more about specific high-risk areas in Metro Atlanta.
Radon Levels
Understand what different radon measurements mean.
Granite Geology
Why Atlanta's geology creates conditions for radon.
Radon Testing
Maps show regional risk, but testing reveals your home's actual levels.
Mitigation Systems
Solutions for homes in high-risk zones.
Radon Safety Resources
Expert insights and guides to keep you informed
Radon Levels Chart: What Every Reading Means, From 0.4 to 20+ pCi/L
A radon levels chart from 0.4 to 20+ pCi/L. What each reading means, the EPA lifetime lung cancer risk at every level for smokers and never-smokers, the WHO reference level, and exactly what to do next at your number.
Read more about Radon Levels Chart: What Every Reading Means, From 0.4 to 20+ pCi/L →
Radon in Holly Springs, Georgia: A Cherokee County Homeowner Guide
A local guide for Holly Springs and Cherokee County homeowners. Why north-Georgia granite geology produces elevated indoor radon in many homes, why every home should be tested regardless of zone, and how testing and mitigation work.
Read more about Radon in Holly Springs, Georgia: A Cherokee County Homeowner Guide →
Radon in Athens, Georgia: An Athens-Clarke County Homeowner Guide
A local guide for Athens and Athens-Clarke County homeowners, landlords, and renters. Why north-Georgia geology produces elevated indoor radon in many homes, why every home and rental should be tested regardless of zone, and how testing and mitigation work.
Read more about Radon in Athens, Georgia: An Athens-Clarke County Homeowner Guide →