1. Why Lilburn Has Radon Risk
Lilburn sits in southwestern Gwinnett County on the Piedmont geological province. The bedrock contains granite and gneiss with uranium that decays into radon gas. This gas migrates through soil and enters homes through foundation cracks, pipe penetrations, and slab joints. The process is continuous and occurs regardless of weather, season, or the age of the home.
Lilburn's housing stock is primarily from the 1970s through the 1990s, with some newer infill development. Many of the established neighborhoods feature ranch homes and split-levels with crawl space foundations. These crawl spaces, when unsealed, provide a direct pathway for radon to enter the living space above. The city also has homes on slab foundations, which are less prone to radon but not immune.
Lilburn's location in southwestern Gwinnett puts it closer to the DeKalb County line, where the Piedmont geology is productive for radon. The city's terrain is gently rolling, and some homes have partial below-grade spaces on sloped lots. Testing is the only way to know your home's actual level. order a professional radon test for a definitive answer.
2. EPA Zone Designation for Lilburn
Lilburn is in Gwinnett County, classified as EPA Zone 2 with predicted average indoor radon levels of 2-4 pCi/L. Lilburn's location in southwestern Gwinnett, near the DeKalb County line, places it on Piedmont geology that is consistent with moderate radon production.
| Zone | Predicted Avg | Risk Level |
|---|---|---|
| Zone 1 (Highest) | Above 4 pCi/L | High |
| Zone 2 (Gwinnett County / Lilburn) | 2-4 pCi/L | Moderate |
| Zone 3 (Lowest) | Below 2 pCi/L | Low |
Every Home Needs Its Own Test
Zone 2 means the county average is moderate, but 18-28% of Lilburn homes test above the EPA action level. Individual results depend on foundation type, construction details, and local soil conditions. Crawl space homes with unsealed soil are particularly worth testing.
3. Neighborhoods with Higher Radon Potential
All Lilburn homes should be tested, but certain areas show patterns:
For broader county-level data, see our Gwinnett County radon guide.
Use our look up radon levels near you to check the risk level for your zip code.
4. Local Testing Data and Trends
Testing data from radon professionals working in Lilburn shows: Neighboring cities like Lawrenceville, Snellville, and Norcross 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 Lilburn Home
Testing is simple and affordable:
Choose Your Test Type
A short-term test (minimum 48 hours) gives a quick snapshot. DIY kits cost $15-40 plus lab fees. Professional CRM testing is standard for real estate transactions.
Place the Test Correctly
Test in the lowest livable level. For crawl space homes, test on the main floor above the crawl space. Keep the device away from windows, walls, and drafts. Maintain closed-house conditions.
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 a professional mitigation system. Above 8 pCi/L: Prioritize mitigation promptly.
6. Mitigation Options for Lilburn Homes
If your Lilburn 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 that pulls radon from beneath and vents it outside.
Both systems reduce radon by 90-99% and are installed in one day. Use our get a personalized cost estimate for a specific estimate.
Lilburn Homeowners
Lilburn's Piedmont geology and housing stock with crawl spaces make radon testing important for every homeowner. A 48-hour test gives you a clear answer. Learn more about how radon mitigation works.
