What are average radon levels in Lawrenceville, Georgia?

Average radon levels in Lawrenceville range from 2.5 to 4.5 pCi/L based on local testing data. Lawrenceville is in Gwinnett County, which the EPA classifies as Zone 2 with predicted averages of 2-4 pCi/L. About 20-30% of tested homes exceed the EPA action level of 4 pCi/L.

Is Gwinnett County a high radon area?

Gwinnett County is classified as EPA Zone 2 (moderate risk), with predicted average indoor radon levels of 2-4 pCi/L. However, the northern and western portions of the county tend to test higher due to the underlying Piedmont granite geology. Individual homes can test well above the county average.

How much does radon mitigation cost in Lawrenceville?

Radon mitigation in Lawrenceville typically costs $1,200 to $2,500 for homes with slab or basement foundations using sub-slab depressurization. Crawl space homes may cost $2,500 to $5,000 due to vapor barrier installation requirements. Both systems reduce radon levels by 90-99% and are installed in a single day.

Does Georgia require radon testing for home sales?

No. Georgia does not require radon testing for real estate transactions. There is no state radon disclosure requirement in Georgia real estate law. However, radon testing during the home inspection period is strongly recommended, especially in Gwinnett County where a meaningful percentage of homes test above the EPA action level.

Can radon levels vary between homes on the same street in Lawrenceville?

Yes. Two homes on the same street can have very different radon levels. The differences come from variations in foundation type, construction details, soil permeability, and even the specific location of cracks and penetrations in the foundation. This is why every home needs its own test regardless of what neighbors have found.

Radon in Lawrenceville, Georgia: Homeowner's Complete Guide

1. Why Lawrenceville Has Radon Risk

Lawrenceville sits in central Gwinnett County on the Piedmont geological province. The bedrock beneath the city is a mix of granite, gneiss, and schist, all of which contain trace amounts of uranium. As uranium decays through the radioactive decay chain, it produces radium, which then decays into radon gas. This gas seeps upward through soil and enters buildings through any opening in the foundation.

As the county seat, Lawrenceville has a diverse housing stock. The historic downtown area features older homes from the early 1900s, while surrounding subdivisions date from the 1980s through today. Many homes in the area have basements or crawl spaces, both of which create pathways for radon to enter. Even slab-on-grade homes are not immune, as radon enters through the slab-to-wall joint, plumbing penetrations, and cracks in the concrete.

Gwinnett County's population has grown dramatically over the past few decades, bringing thousands of new homes across the Lawrenceville area. Each of these homes sits on the same geology and carries radon risk that can only be assessed through testing. have radon testing performed to find out where your home stands.

2. EPA Zone Designation for Lawrenceville

Lawrenceville is part of Gwinnett County, which the EPA classifies as Zone 2 with predicted average indoor radon levels between 2 and 4 pCi/L. This places the county in the moderate risk category, though individual homes can test significantly above this range.

Zone	Predicted Avg	Risk Level
Zone 1 (Highest)	Above 4 pCi/L	High
Zone 2 (Gwinnett County / Lawrenceville)	2-4 pCi/L	Moderate
Zone 3 (Lowest)	Below 2 pCi/L	Low

Zone Averages Do Not Predict Individual Homes

The Zone 2 label covers the entire county, which spans a large area with varying geology. Western and northern parts of Gwinnett County tend to have higher radon levels than the eastern portions. Lawrenceville's central location means testing data varies widely from home to home. Never assume your home is safe based on a zone designation alone.

3. Neighborhoods with Higher Radon Potential

Every Lawrenceville home should be tested, but certain areas show patterns of elevated readings:

Collins Hill area. Subdivisions near Collins Hill Road and Collins Hill High School were built primarily in the 1990s on hilly terrain. Many homes have walkout basements with finished living space below grade. The combination of below-grade rooms and granite geology creates conditions where elevated radon readings are not uncommon.

Archer area/Scenic Highway. Homes along Scenic Highway and near Archer High School sit on terrain that varies from flat to gently rolling. The mix of foundation types (slab, crawl space, and basement) means radon risk varies, but crawl space homes in this area with unsealed soil exposure tend to test higher.

Historic downtown Lawrenceville. Older homes around the Lawrenceville square and surrounding streets include houses from the early 1900s through mid-century. These homes often have stone or block foundations with more settling and cracking than newer construction, providing more entry points for radon gas.

Sugarloaf Parkway corridor. Newer subdivisions along Sugarloaf Parkway feature a mix of slab and basement homes. While newer construction may have tighter foundations, the underlying geology still produces radon. These homes should be tested after construction is complete.

For broader county-level data, see our Gwinnett County radon guide.

Use our check your neighborhood's radon risk to check the risk level for your Lawrenceville zip code.

4. Local Testing Data and Trends

Testing data from radon professionals working in Lawrenceville shows these patterns: Neighboring cities like Snellville, Duluth, and Lilburn show similar radon patterns due to shared geology.

Average test results in Lawrenceville range from 2.5 to 4.5 pCi/L, consistent with the Zone 2 designation but with significant variation between homes.

Approximately 20-30% of tested homes exceed the EPA action level of 4 pCi/L.

Homes with basements test 30-50% higher on average than slab-on-grade homes in the same area.

Winter testing consistently produces higher results than summer testing. A result between 2 and 4 pCi/L in summer may cross the action level during winter months.

Gwinnett County's active real estate market means radon testing during home purchases is increasingly common. See our home inspection radon guide for details.

5. How to Test Your Lawrenceville Home

Testing for radon is simple and affordable. Here is the recommended approach:

Choose Your Test Type

A short-term test (minimum 48 hours) provides a quick snapshot. Professional CRM testing is standard for real estate transactions and provides hourly data. DIY charcoal kits cost $15-40 plus lab fees.

Place the Test Correctly

Test in the lowest livable level. If you have a basement, test there. For slab or crawl space homes, test on the main floor. Keep the device away from windows, exterior 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 a follow-up long-term test or mitigation. Above 4 pCi/L: The EPA recommends radon mitigation for your home. Above 8 pCi/L: Prioritize mitigation promptly.

6. Mitigation Options for Lawrenceville Homes

If your Lawrenceville home tests above 4 pCi/L, mitigation is effective and straightforward:

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 typically installed in a single day. Use our view mitigation cost estimates for a more specific estimate.

Lawrenceville Homeowners

Lawrenceville's Piedmont geology means radon testing should be on every homeowner's list. A 48-hour test gives you a clear answer, and if mitigation is needed, it is a one-day installation. Learn more about how radon mitigation works.