Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
Locations and reports
Radon Levels in Chatham County, Georgia
EPA puts Chatham County in Zone 3, its lowest radon zone, and most reported tests there come back low, though 0.0% of 45 (2008 to 2017, laboratory totals) reached 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
0.0%
24.8 pts below GA
- Chatham
- 0.0%
- Georgia
- 24.8%
45 tests, 2008 to 2017
Median result
0.6pCi/L
Below action level
- Chatham
- 0.6 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
45
52nd of 57 by tests
- Chatham
- 45
- Fulton
- 4,858
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Rank in Georgia
56 of 57
Lowest quarter
- Chatham
- 0.0%
- Barrow
- 48.3%
By share, of 57 with 30+ tests
Read a result for Chatham County
Starts at Chatham County's median, 0.6 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 0.6 pCi/L
Below 2 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Chatham County's median reported result, 2008 to 2017.
The data
Chatham County, At a glance
Chatham County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 93% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Chatham County, 2008 to 2017, laboratory
Under 2 pCi/L: 98%2 to 4 pCi/L: 2%4 pCi/L and above: 0%
Of 45 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 44 | 97.8% |
| 2 to 4 pCi/L | 1 | 2.2% |
| 4 pCi/L and above | 0 | 0.0% |
What these figures count
These are the 45 tests reported to CDC for Chatham County over 2008 to 2017 (laboratory totals), many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.
Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Chatham County, Compared
Chatham County radon figures, compared
Calculated by Radon411Only 0 of 45 radon tests reported for Chatham County over the 2008 to 2017 laboratory totals reached 4 pCi/L (0.0%). The median result, 0.6 pCi/L, sits below 2, well under EPA's 4 pCi/L action level, and the top reported result was 2.1 pCi/L.
Across 129 Georgia counties pooled together, 24.8% of tests reached that level, so Chatham County runs 24.8 points below its state. Against the national pool of 35.7%, the gap is 35.7 points lower. Its place in the state: 56th of 57 Georgia counties with 30 or more tests for the same period.
Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 0.0% share point the same way here.
Below the action level, 44 tests (97.8%) came in under 2 pCi/L, against 44.0% statewide, and 1 tests (2.2%) fell between 2 and 4, against 31.2% statewide. USGS geology rates 93% of the county's land low radon potential.
CDC's ten-year totals for Chatham County went from 45 tests (2005 to 2014) to 45 (2008 to 2017), the share going from 0.0% to 0.0%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Chatham County, Geology
The ground under Chatham County
PredictedUSGS's geologic map puts all of Chatham County's mapped land in one class: low radon potential. 92.5% of it lies in the area the map calls Coastal Plain, to which USGS gives a radon index of 7, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Coastal Plain | Quaternary and Pleistocene-Pliocene coastal sand and gravel, lagoon and marsh clay and silt. | Low | 7 | 92.5% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Chatham County beside the ground around it
Across Georgia 26.5% of the land is rated moderate; none of Chatham County's is. None of the 3 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Chatham County, Local resources
Radon testing and mitigation in Chatham County
- Georgia's radon programGeorgia Attorney General's Consumer Protection DivisionGeorgia's radon program does not license radon professionals and offers free or discounted test kits, and answers questions about testing and mitigation in Georgia.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
A kit costs $15.00 if mailed or $10.00 if picked up at a participating County Extension office.
- Compare kits
- Professionals in Georgia3 professionals are listed in Georgia.
What Georgia's program says
- Licensing of radon professionals
There are no laws mandating a mitigator receive certification in Georgia, however, many mitigators choose to get certified by one of two national programs.
What it means
Chatham County, Questions
Questions about radon in Chatham County
Are radon levels high in Chatham County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Chatham County, Georgia were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.6 pCi/L. Of 57 Georgia counties with 30 or more tests for the same period, 55 reported a higher share; pooled, the state comes to 24.8%.
Which counties border Chatham County?
Chatham County borders 3 counties: Bryan County, GA, Effingham County, GA and Jasper County, SC.
Products
Chatham County, Products
Testing a home in Chatham County
In Chatham County, 0.0% of 45 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 24.8% pooled across Georgia. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Chatham County.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Monitor
Corentium Home battery digital radon detector
- C-NRPP 2024/25: Approved
- Battery
- Screen
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Chatham County, Bordering counties
Counties bordering Chatham County
Calculated by Radon411- Radon levels in Bryan County, GAEPA zone 3
0.0%at or above 4 pCi/L
Median 2.1 pCi/L · 1 test · 0.0 points above Chatham County
- Radon levels in Effingham County, GAEPA zone 3
0.0%at or above 4 pCi/L
Median 1.2 pCi/L · 8 tests · 0.0 points above Chatham County
- Radon levels in Jasper County, SCEPA zone 3
0.0%at or above 4 pCi/L
Median 0.6 pCi/L · 9 tests · 0.0 points above Chatham County
Chatham County, Cities and towns
Cities and towns in Chatham County
Chatham County is growing: the Census Bureau puts it at 311,855 residents on July 1, 2025, up 5.7% from 295,113 in 2020. That works out to 720 people per square mile of land. Its largest town, Savannah, has 149,440 residents, 47.9% of the total. Together its 8 incorporated places hold 70.3% of those residents; the other 29.7% live outside any of them. Reported testing is thin here: 45 tests over 2008 to 2017, or 0.1 for every 1,000 residents (2025 estimate), where Georgia as a whole comes to 2.7.
From Savannah to Vernonburg, CDC publishes no figure by town: each reads Chatham County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Savannah | 149,440 | +1.3% | 47.9% |
| Pooler | 32,744 | +27.6% | 10.5% |
| Port Wentworth | 17,604 | +61.3% | 5.6% |
| Garden City | 10,513 | +1.0% | 3.4% |
| Tybee Island | 3,156 | +1.6% | 1.0% |
| Bloomingdale | 3,077 | +7.7% | 1.0% |
| Thunderbolt | 2,534 | −0.8% | 0.8% |
| Vernonburg | 141 | +2.2% | Under 0.1% |
8 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).
Chatham County, Homes
Homes in Chatham County
Of Chatham County's 135,983 homes, 61% are detached houses, against 66% across Georgia; 19% are in buildings of five or more homes. Half of its homes were built before 1985, close to Georgia's 1991: 24% date from before 1960 and 32% from 2000 or later. 56% of occupied homes are lived in by their owner (Georgia: 65%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Chatham County | Georgia |
|---|---|---|
| Housing units | 135,983 | 4,483,873 |
| Detached houses | 61% | 66% |
| In buildings of 5 or more | 19% | 16% |
| Mobile homes | 3% | 8% |
| Built before 1960 | 24% | 12% |
| Built since 2000 | 32% | 33% |
| Middle year built | 1985 | 1991 |
| Owner-occupied | 56% | 65% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.