Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
Locations and reports
Radon Levels in Berkeley County, South Carolina
EPA puts Berkeley County in Zone 3, its lowest radon zone, and most reported tests there come back low, though 4.0% of 99 (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
4.0%
15.4 pts below SC
- Berkeley
- 4.0%
- SC
- 19.4%
99 tests, 2008 to 2017
Median result
0.7pCi/L
Below action level
- Berkeley
- 0.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
99
18th of 24 by tests
- Berkeley
- 99
- Greenville
- 12,004
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 SC
20 of 24
Lowest quarter
- Berkeley
- 4.0%
- Oconee
- 42.6%
By share, of 24 with 30+ tests
Read a result for Berkeley County
Starts at Berkeley County's median, 0.7 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 0.7 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. Berkeley County's median reported result, 2008 to 2017.
The data
Berkeley County, At a glance
Berkeley County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 99% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Berkeley County, 2008 to 2017, laboratory
Under 2 pCi/L: 91%2 to 4 pCi/L: 5%4 pCi/L and above: 4%
Of 99 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 90 | 90.9% |
| 2 to 4 pCi/L | 5 | 5.1% |
| 4 pCi/L and above | 4 | 4.0% |
What these figures count
These are the 99 tests reported to CDC for Berkeley 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).
Berkeley County, Compared
Berkeley County radon figures, compared
Calculated by Radon411Only 4 of 99 radon tests reported for Berkeley County over the 2008 to 2017 laboratory totals reached 4 pCi/L (4.0%). The median result, 0.7 pCi/L, sits below 2, well under EPA's 4 pCi/L action level, and the top reported result was 7.9 pCi/L.
Across 46 South Carolina counties pooled together, 19.4% of tests reached that level, so Berkeley County runs 15.4 points below its state. Against the national pool of 35.7%, the gap is 31.7 points lower. Its place in the state: 20th of 24 South Carolina counties with 30 or more tests for the same period.
Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 4.0% share point the same way here. Of 3 neighbours with a figure, 2 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 1.5% (Charleston County) to 5.7% (Orangeburg County).
Below the action level, 90 tests (90.9%) came in under 2 pCi/L, against 57.4% statewide, and 5 tests (5.1%) fell between 2 and 4, against 23.1% statewide. USGS geology rates 99% of the county's land low radon potential.
CDC's ten-year totals for Berkeley County went from 86 tests (2005 to 2014) to 99 (2008 to 2017), the share going from 4.7% to 4.0%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Berkeley County, Geology
The ground under Berkeley County
PredictedUSGS's geologic map puts all of Berkeley County's mapped land in one class: low radon potential. 99.4% of it lies in the area the map calls Lower 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 |
|---|---|---|---|---|
| Lower Coastal Plain | Dune, beach, and marine sediments. | Low | 7 | 99.4% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Berkeley County beside the ground around it
Across South Carolina 0.2% of the land is rated high; none of Berkeley County's is. None of the 6 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Berkeley County, Local resources
Radon testing and mitigation in Berkeley County
Listed radon businesses with an address in Berkeley County:
- South Carolina Radon ProgramSouth Carolina Radon Program, run by South Carolina Department of Environmental Services, offers free or discounted test kits, and answers questions about testing and mitigation in South Carolina.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
The South Carolina Radon Program offers free short-term radon test kits to South Carolina homeowners, subject to availability.
- Compare kits
- Professionals in South Carolina2 professionals are listed in South Carolina.
Listed radon professionals by town: Moncks Corner
What South Carolina's program says
- Phone
- 1-800-768-0362
- radon@des.sc.gov
What it means
Berkeley County, Questions
Questions about radon in Berkeley County
Are radon levels high in Berkeley County?
Over the 2008 to 2017 laboratory totals, 4.0% of the radon tests reported to CDC for Berkeley County, South Carolina were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.7 pCi/L. Of 24 South Carolina counties with 30 or more tests for the same period, 19 reported a higher share; pooled, the state comes to 19.4%.
Which counties border Berkeley County?
Berkeley County borders 6 counties: Charleston County, Williamsburg County, Dorchester County, Georgetown County, Clarendon County and Orangeburg County.
Products
Berkeley County, Products
Testing a home in Berkeley County
In Berkeley County, 4.0% of 99 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 19.4% pooled across South Carolina. 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 Berkeley County.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL416 long-term radon test kit, lab fee included
- Lab fee included
Method: Alpha track
In home: 90 days to 12 months
Monitor
RM-65 rechargeable radon detector with a color screen and alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Berkeley County, Bordering counties
Counties bordering Berkeley County
Calculated by Radon411- Radon levels in Orangeburg CountyEPA zone 3
5.7%at or above 4 pCi/L
Median 0.9 pCi/L · 53 tests · 1.7 points above Berkeley County
- Radon levels in Dorchester CountyEPA zone 3
4.8%at or above 4 pCi/L
Median 1.0 pCi/L · 104 tests · 0.8 points above Berkeley County
- Radon levels in Charleston CountyEPA zone 3
1.5%at or above 4 pCi/L
Median 0.6 pCi/L · 272 tests · 2.5 points below Berkeley County
- Radon levels in Williamsburg CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.6 pCi/L · 14 tests · 4.0 points below Berkeley County
- Radon levels in Georgetown CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 29 tests · 4.0 points below Berkeley County
- Radon levels in Clarendon CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.8 pCi/L · 3 tests · 4.0 points below Berkeley County
Berkeley County, Cities and towns
Cities and towns in Berkeley County
Berkeley County is growing: the Census Bureau puts it at 274,666 residents on July 1, 2025, up 18.7% from 231,478 in 2020. That works out to 249 people per square mile of land. Charleston, the largest place on its list (159,423 residents in all), extends beyond Berkeley County, so no share of the total is worked out for it. Reported testing is thin here: 99 tests over 2008 to 2017, or 0.4 for every 1,000 residents (2025 estimate), where South Carolina as a whole comes to 4.8.
From Charleston to Jamestown, CDC publishes no figure by town: each reads Berkeley County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Charlestonextends beyond Berkeley County | 159,423 | +5.4% | Counted whole |
| North Charlestonextends beyond Berkeley County | 129,245 | +11.8% | Counted whole |
| Summervilleextends beyond Berkeley County | 53,177 | +4.4% | Counted whole |
| Goose Creek | 52,010 | +12.2% | 18.9% |
| Hanahan | 22,415 | +8.9% | 8.2% |
| Moncks Corner | 20,612 | +53.4% | 7.5% |
| St. Stephen | 1,623 | +2.8% | 0.6% |
| Bonneau | 437 | +1.9% | 0.2% |
| Jamestown | 70 | +1.4% | Under 0.1% |
9 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). A place that extends beyond Berkeley County is counted whole, so it has no share.
Berkeley County, Homes
Homes in Berkeley County
Of Berkeley County's 97,512 homes, 65% are detached houses, against 64% across South Carolina; 15% are mobile homes. Much of Berkeley County is recent building: 51% of its homes have gone up since 2000 and the middle year built is 2000, against 1991 for South Carolina. 74% of occupied homes are lived in by their owner (South Carolina: 71%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Berkeley County | South Carolina |
|---|---|---|
| Housing units | 97,512 | 2,401,638 |
| Detached houses | 65% | 64% |
| In buildings of 5 or more | 13% | 13% |
| Mobile homes | 15% | 15% |
| Built before 1960 | 4% | 13% |
| Built since 2000 | 51% | 35% |
| Middle year built | 2000 | 1991 |
| Owner-occupied | 74% | 71% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.