1. Why Duluth Has Radon Risk
Duluth sits in western Gwinnett County on the Piedmont geological province. The bedrock here is granite and gneiss that contains uranium, which decays into radon gas. This gas migrates through soil and enters homes through foundation openings including cracks, pipe penetrations, and the slab-to-wall joint.
Duluth's housing stock includes established subdivisions from the 1980s and 1990s, newer townhome developments near the revitalized downtown, and single-family homes across a range of price points. Foundation types vary from slab-on-grade to crawl space, with some homes having partial basements on sloped lots.
The city's location in western Gwinnett County places it near the boundary with Fulton County, where the Piedmont granite tends to be more productive for radon. Duluth's western neighborhoods may have slightly higher radon levels than the eastern portions, though individual home results depend on foundation type and local soil conditions. get tested for radon to find out your level.
2. EPA Zone Designation for Duluth
Duluth 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 the entire county, though actual levels vary by location within the county.
| Zone | Predicted Avg | Risk Level |
|---|---|---|
| Zone 1 (Highest) | Above 4 pCi/L | High |
| Zone 2 (Gwinnett County / Duluth) | 2-4 pCi/L | Moderate |
| Zone 3 (Lowest) | Below 2 pCi/L | Low |
Individual Testing Is the Only Reliable Assessment
Zone 2 means the county average is moderate, but 20-30% of Duluth homes test above the action level. Two homes on the same block can have very different results based on foundation type and construction details. The zone map does not predict your individual home's level.
3. Neighborhoods with Higher Radon Potential
All Duluth homes should be tested, but certain areas show patterns:
For broader county-level data, see our Gwinnett County radon guide.
Use our search radon risk for your zip code to check the risk level for your zip code.
4. Local Testing Data and Trends
Testing data from radon professionals working in Duluth shows: Neighboring cities like Suwanee, Norcross, and Lawrenceville show similar radon patterns due to shared geology.
See our home inspection radon guide for details on testing during purchase.
5. How to Test Your Duluth Home
Testing is straightforward and affordable:
Choose Your Test Type
A short-term test (minimum 48 hours) gives 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.
Interpret Your Results
Below 2 pCi/L: Low risk, retest every 2 years. Between 2-4 pCi/L: Consider follow-up testing. Above 4 pCi/L: The EPA recommends radon removal services. Above 8 pCi/L: Prioritize mitigation promptly.
6. Mitigation Options for Duluth Homes
If your Duluth 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 get a radon system quote estimate for a specific estimate.
For more information, read our guide to reading radon test results.
Duluth 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.
