1. Why Norcross Has Radon Risk
Norcross sits in western Gwinnett County on the Piedmont geological province. The bedrock beneath the city includes granite and gneiss that contain uranium. As uranium decays, it produces radon gas that migrates through soil and enters buildings through foundation openings. Every home in the area is exposed to this geological radon source.
The city's housing stock includes older homes near the charming downtown area, suburban subdivisions from the 1980s and 1990s, and a variety of apartment and townhome complexes. Foundation types range from crawl spaces on older homes to slabs on newer construction. Each type presents its own radon entry pathways.
Norcross' location in western Gwinnett County places it closer to the higher-risk geology found in neighboring DeKalb and Fulton counties. While the county-wide Zone 2 designation indicates moderate risk, individual Norcross homes can test well above the county average. professional radon testing to find out your level.
2. EPA Zone Designation for Norcross
Norcross is in Gwinnett County, classified as EPA Zone 2 with predicted average indoor radon levels between 2 and 4 pCi/L. This moderate risk designation covers a large and geologically diverse county. Western Gwinnett, where Norcross is located, tends to have somewhat higher levels than the eastern portions.
| Zone | Predicted Avg | Risk Level |
|---|---|---|
| Zone 1 (Highest) | Above 4 pCi/L | High |
| Zone 2 (Gwinnett County / Norcross) | 2-4 pCi/L | Moderate |
| Zone 3 (Lowest) | Below 2 pCi/L | Low |
Moderate Risk Does Not Mean No Risk
Zone 2 means the county average is between 2-4 pCi/L, but 18-28% of tested homes exceed the EPA action level. Norcross' location in western Gwinnett, closer to the productive geology of DeKalb and Fulton counties, means the local data can skew above the county average. Testing your individual home is the only reliable way to assess risk.
3. Neighborhoods with Higher Radon Potential
Every Norcross home should be tested, but certain areas show patterns:
For broader county-level data, see our Gwinnett County radon guide.
Use our find out if your area has high radon to check the risk level for your zip code.
4. Local Testing Data and Trends
Testing data from radon professionals working in Norcross shows: Neighboring cities like Duluth, Lilburn, and Suwanee show similar radon patterns due to shared geology.
See our home inspection radon guide for details on testing during a home purchase.
5. How to Test Your Norcross Home
Testing is simple and affordable:
Choose Your Test Type
A short-term test (minimum 48 hours) provides a quick snapshot. Professional CRM testing is standard for real estate. DIY kits cost $15-40 plus lab fees.
Place the Test Correctly
Test in the lowest livable level. Keep the device away from windows, walls, and drafts. Maintain closed-house conditions throughout the test period.
Interpret Your Results
Below 2 pCi/L: Low risk, retest every 2 years. Between 2-4 pCi/L: Consider follow-up testing or mitigation. Above 4 pCi/L: The EPA recommends professional radon reduction. Above 8 pCi/L: Prioritize mitigation promptly.
6. Mitigation Options for Norcross Homes
If your Norcross home tests above 4 pCi/L, mitigation is effective:
Slab or Basement
$1,200-$2,500
Sub-slab depressurization: a suction point drilled through the foundation, connected to PVC pipe and a fan that vents radon above the roofline.
Crawl Space
$2,500-$5,000
Sub-membrane depressurization: a sealed vapor barrier over exposed soil with active suction beneath.
Both systems reduce radon by 90-99% and are installed in one day. Use our calculate your mitigation cost for a specific estimate.
Norcross Homeowners
A 48-hour test gives you a definitive answer about your home's radon level. If mitigation is needed, it is a one-day installation. Learn more about how radon mitigation works.
