What are average radon levels in Brookhaven, Georgia?

Average radon levels in Brookhaven range from 2.5 to 4.5 pCi/L based on local testing data. Brookhaven is in DeKalb County, which the EPA classifies as Zone 2. About 18-28% of tested homes exceed the EPA action level of 4 pCi/L, with basement homes testing significantly higher than slab homes.

Does Brookhaven have a radon problem?

Brookhaven has moderate radon risk. The city sits on Piedmont geology in DeKalb County that produces radon gas. Many Brookhaven homes have basements and crawl spaces that provide entry pathways. While not as high-risk as cities in Zone 1 counties, a meaningful percentage of homes test above the EPA action level.

How much does radon mitigation cost in Brookhaven?

Radon mitigation in Brookhaven typically costs $1,200 to $2,500 for slab or basement homes using sub-slab depressurization. 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.

Should I test my Brookhaven townhome for radon?

Ground-floor and basement-level units should be tested. Brookhaven has experienced significant townhome and condo development in recent years. Units with slab foundations in direct contact with soil can accumulate radon, especially in DeKalb County's Piedmont geology. Upper-floor units are at lower risk.

Are renovated Brookhaven homes at higher radon risk?

Renovated homes can have changed radon conditions compared to the original structure. If a renovation added below-grade space (like finishing a basement), created new foundation penetrations, or changed the HVAC system, radon levels may be different than before. Any home that has undergone significant renovation should be retested.

Radon in Brookhaven, Georgia: Testing and Mitigation Guide

1. Why Brookhaven Has Radon Risk

Brookhaven occupies a large section of northern DeKalb County, bordered by Chamblee, Atlanta, and unincorporated DeKalb. The city sits on the Piedmont geological province, where metamorphic and igneous rock contains uranium that decays into radon gas. This gas migrates through soil and enters homes through foundation openings.

Brookhaven's housing stock is remarkably diverse. The city includes mid-century ranch homes in Ashford Park, cottage-style homes in Drew Valley, and extensive new construction and teardown-rebuild activity throughout. Many of the established neighborhoods feature homes with basements and crawl spaces that create direct pathways for radon to enter living areas.

The wave of renovation and new construction in Brookhaven adds another consideration. When older homes are renovated, changes to the foundation, HVAC system, and below-grade spaces can alter radon dynamics. New construction on the same lots can have different radon levels than the original homes. Testing after any significant construction work is recommended. test your home for radon to find out your level.

2. EPA Zone Designation for Brookhaven

Brookhaven is in DeKalb County, which the EPA classifies as Zone 2 with predicted average indoor radon levels between 2 and 4 pCi/L. This moderate risk designation means a meaningful percentage of homes will test above the EPA action level of 4 pCi/L.

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

Individual Testing Is Essential

Brookhaven's mix of old and new construction means radon levels can vary dramatically from home to home, even on the same block. A renovated home with a new basement may test very differently than the original structure. Zone averages do not predict individual home risk.

3. Neighborhoods with Higher Radon Potential

Every Brookhaven home should be tested, but certain neighborhoods show patterns worth noting:

Ashford Park. One of Brookhaven's most popular neighborhoods, Ashford Park features a mix of original mid-century ranch homes and newer construction on teardown lots. Homes with basements, whether original or added during renovation, should be tested. The neighborhood's active renovation market means many homes have changed structurally, which can affect radon entry.

Lynwood Park. This neighborhood includes smaller homes from the mid-1900s, many with crawl space foundations. Unsealed crawl spaces provide direct soil exposure beneath the living area. Homes in Lynwood Park that have not had their crawl spaces encapsulated are at higher risk for elevated radon.

Drew Valley. Drew Valley features cottage-style homes and newer infill construction. The terrain in parts of Drew Valley is sloped, which means some homes have partial below-grade spaces even if they appear to be single-story from the front. These below-grade areas increase radon accumulation potential.

Town Brookhaven/Peachtree Road corridor. Newer condo and townhome developments along Peachtree Road and near Town Brookhaven are primarily built on slab foundations. Ground-floor units should be tested, as radon can enter through slab penetrations and perimeter joints even in modern construction.

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

Use our look up radon risk in your neighborhood to check the risk level for your Brookhaven zip code.

4. Local Testing Data and Trends

Testing data from radon professionals working in Brookhaven shows these patterns: Neighboring cities like Dunwoody, Decatur, and Tucker show similar radon patterns due to shared geology.

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

Approximately 18-28% of tested homes exceed the EPA action level of 4 pCi/L.

Homes with basements test notably higher than slab homes. New construction with basements added to former slab lots can test above the action level.

Winter testing produces results 40-60% higher than summer testing in the same homes.

Brookhaven's active real estate market makes radon testing during home purchases important. See our home inspection radon guide for the process.

5. How to Test Your Brookhaven Home

Testing is straightforward. 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. DIY charcoal kits cost $15-40 plus lab fees.

Place the Test Correctly

Test in the lowest livable level. For homes with basements, test there. For slab or crawl space homes, test on the main floor. 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 or mitigation. Above 4 pCi/L: The EPA recommends reduce your radon levels. Above 8 pCi/L: Prioritize mitigation promptly.

6. Mitigation Options for Brookhaven Homes

If your Brookhaven 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 get a cost estimate for radon mitigation for a more specific estimate.

Brookhaven Homeowners

Whether you live in a renovated mid-century home or new construction, Brookhaven's Piedmont geology means radon testing is important. A 48-hour test gives you a clear answer. Learn more about how radon mitigation works.

Radon in Brookhaven, Georgia: Testing and Mitigation Guide

1. Why Brookhaven Has Radon Risk