Professional radon testing inspector in Roswell GA home

Radon Testing in Roswell, GA

Roswell averages 4.2 pCi/L, above the EPA action level of 4.0

Professional continuous-monitor testing for Historic Roswell, East Roswell, West Roswell, Willeo, and every Roswell neighborhood. 48-hour results.

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Why Radon Testing Matters in Roswell

Roswell sits on the Piedmont granite of North Fulton County. The uranium in this granite naturally decays into radon gas, which enters homes through the foundation. Roswell's mix of historic homes, established subdivisions, and newer construction means radon risk varies by property.

4.2

Avg pCi/L

Above EPA 4.0 action level

Zone 1

EPA Classification

Highest radon risk category

17,000+

Homes Affected

Estimated elevated radon in Roswell

Average Is Only Part of the Story

Roswell's 4.2 pCi/L average means many individual homes test well above that. We regularly see Roswell readings of 6, 8, and 10+ pCi/L, especially in Historic District basements, Willeo-area homes with granite outcroppings, and Martin's Landing homes with finished lower levels. The only way to know your home's level is to test.

New to Roswell?

Many families relocate to Roswell for the top-rated schools, proximity to the Chattahoochee River, and Historic District charm. If you are moving here, radon may not be on your radar. Here is what you need to know:

Roswell sits on radon-producing granite

North Fulton County, including Roswell, sits on Piedmont granite that naturally produces uranium, which decays into radon gas. This geology extends from Mountain Park through Willeo and throughout Roswell.

Historic homes test higher

Many Roswell homes in the Historic District date to the 1800s. Original foundations, settled masonry, and partial basements create more radon entry points than modern construction. Testing is essential for any historic Roswell purchase.

New Roswell construction is not exempt

Hardscrabble, Coleman Road, and newer subdivisions have slab-on-grade homes built in the last 20 years. The granite below still produces radon. New construction with slab foundations routinely tests above the EPA action level.

Georgia has no radon disclosure law

Unlike some states, Georgia does not require sellers to disclose radon. If you are buying in Roswell, you need to request testing during your due diligence period. Buyers' inspections now commonly include radon.

Radon Testing Methods

Short-Term Testing

48-hour to 7-day tests work for Roswell real estate transactions and initial screening. Standard charcoal canisters or electret chambers measure average radon during the test period.

2-7 daysInitial screening

Long-Term Testing

90+ day tests using alpha track detectors. Valuable for Roswell homeowners who want the annual average, especially in historic homes where seasonal variation is pronounced.

90+ daysAnnual average

Continuous Radon Monitors

Electronic monitors with hourly data and tamper detection. Our primary method for Roswell homes and the standard required by most real estate transactions.

48+ hoursReal estate & accuracy

Our Roswell Testing Process

Schedule

Book by phone or online. Roswell appointments are typically available within 1-3 business days. For real estate due diligence we prioritize same-week scheduling.

Placement

Monitors are placed on the lowest lived-in level: a basement for Martin's Landing and Country Club of Roswell homes, the main floor for slab-on-grade homes in Hardscrabble or Coleman Road, or the first floor above a crawl space for Historic Roswell cottages.

Testing

Continuous monitors record hourly readings for a minimum of 48 hours under closed-home conditions. Roswell's winter HVAC patterns often show higher readings than summer tests, but testing is valid year-round.

Results

Detailed report with hourly graph, period average, and next-step recommendations within 48 hours of pickup. Reports are accepted by Roswell-area real estate agents and closing attorneys.

Roswell Neighborhoods We Serve

Historic Roswell1800s-1900s homes with partial basements and crawl spaces

East RoswellMid-century and 1990s subdivisions, mixed foundations

West RoswellEstablished neighborhoods, many with basements

Willeo / Mountain ParkGranite outcroppings, higher-than-average readings

Martin's LandingEstablished 1970s-1980s community, basement homes

Horseshoe BendGolf course community, mix of estate and standard homes

Country Club of RoswellLarger executive homes with finished basements

Crabapple / Milton BorderCustom builds and older homes with crawl spaces

Crossville Road CorridorMixed residential and commercial, varied housing

Holcomb Bridge AreaDense residential, townhomes and single-family

King Road AreaOlder neighborhoods with basement homes

Coleman Road / HardscrabbleNewer subdivisions with slab foundations

Roswell Radon Testing FAQs

How much does radon testing cost in Roswell?

Professional radon testing in Roswell typically costs $150 to $200 for a 48-hour continuous monitor test. Larger homes (4,000+ sq ft) or multi-level homes that need two monitors may run slightly higher. The fee includes placement, pickup, hourly data analysis, and a detailed report.

What is the average radon level in Roswell?

Roswell's average indoor radon level is approximately 4.2 pCi/L, above the EPA action level of 4.0 pCi/L. Individual homes vary widely: some test below 2.0 pCi/L, others exceed 10 pCi/L. The mix of historic homes with basements, granite-heavy areas around Willeo and Mountain Park, and a wide age range of construction means results are not predictable without testing.

Should I test my historic Roswell home?

Yes, especially if you use the basement or lowest level as living space. Historic Roswell homes tend to test higher than newer construction because of older foundations, partial basements, and original masonry that has settled over decades. Testing the basement level is particularly important if it has been converted to living space.

Are Willeo and Mountain Park really higher risk?

Yes. Granite outcroppings are visible throughout the Willeo and Mountain Park areas, and the same granite exists below homes at depth. Radon levels can be locally higher in these micro-areas. We regularly measure Willeo-area homes in the 6 to 10 pCi/L range.

Do new Roswell homes in Hardscrabble or Coleman Road need testing?

Yes. Any home in Roswell should be tested regardless of age. New subdivisions on Hardscrabble Road and Coleman Road sit on the same North Fulton granite. Slab-on-grade construction still allows radon entry through slab joints, utility penetrations, and sump pits. Many new-construction homes in these areas test above 4.0 pCi/L.

How long does testing take in Roswell?

Short-term continuous monitor tests run a minimum of 48 hours. Most Roswell tests complete in 48-72 hours. Results are delivered within 48 hours after pickup, so the full process from placement to report is typically 4 to 5 days.

Do I need to leave my home during testing?

No. You stay in your home as normal during the 48-hour test. The main requirement is closed-home conditions: keep windows and exterior doors closed except for normal entry and exit. Avoid operating window fans, whole-house fans, and prolonged fireplace use. Your routine is otherwise unaffected.

What happens if my Roswell home tests high?

If the result is 4.0 pCi/L or higher, the EPA recommends mitigation. For most Roswell homes, a standard mitigation system costs $1,200 to $2,500. Historic Roswell homes may require custom routing to preserve architectural character. Crawl space homes cost more ($1,800 to $3,500) because of the membrane installation. We review results and outline options once testing is complete.