What are average radon levels in Duluth, Georgia?

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

Is Duluth at risk for radon?

Yes. Duluth sits on Piedmont geology in Gwinnett County that produces radon gas. The moderate risk designation means a meaningful percentage of homes test above the EPA action level. Both older and newer homes in Duluth should be tested.

How much does radon mitigation cost in Duluth?

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

Does Duluth's downtown development affect radon risk?

New development in downtown Duluth, including townhomes and mixed-use buildings, sits on the same Piedmont geology as the rest of the city. Ground-floor units in new construction should be tested. Modern building practices may reduce some radon entry points, but they do not eliminate the risk entirely.

Should I test for radon when buying a home in Duluth?

Yes. Testing during the inspection period costs $125-250 for professional CRM testing and provides data to negotiate if levels are elevated. Georgia does not require radon testing for home sales, so the buyer must request it.

Radon in Duluth, Georgia: Radon Levels and Testing Guide

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:

Parsons Road area. Established subdivisions near Parsons Road feature homes from the 1990s, many with crawl space or slab foundations. Homes with unsealed crawl spaces in this area provide direct soil exposure beneath the living area. These homes tend to test higher than sealed slab homes nearby.

Sugarloaf area. Subdivisions near Sugarloaf Parkway include larger homes, some with walkout basements on sloped lots. The below-grade living space in these homes creates more surface area in contact with soil, increasing radon accumulation potential.

Downtown Duluth. The downtown revitalization has brought new townhome and condo development. Ground-floor units in these new buildings should be tested. Even modern slab construction on Piedmont geology allows radon entry through penetrations.

Pleasant Hill Road corridor. A mix of older homes and newer development along Pleasant Hill Road sits on terrain that transitions from flat to gently rolling. The geological transition in this area creates variable radon potential from lot to lot.

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.

Average test results range from 2.5 to 4.5 pCi/L, consistent with Gwinnett County's Zone 2 designation.

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

Homes with basements or crawl spaces test higher than slab homes in the same area.

Winter testing produces results 40-60% higher than summer testing.

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.