Short-term kitempowerDX
Standard Radon Test short-term mail-in radon test kit
- Lab fee included
Method: Passive sampler
In home: 48 to 96 hours
Locations and reports
Radon Levels in Spartanburg County, South Carolina
EPA puts Spartanburg County in Zone 2, its middle radon zone, and 19.1% of its 3,280 reported radon tests (2008 to 2017, laboratory totals) were at or above 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
19.1%
0.3 pts below SC
- Spartanburg
- 19.1%
- SC
- 19.4%
3,280 tests, 2008 to 2017
Median result
1.7pCi/L
Below action level
- Spartanburg
- 1.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
3,280
2nd of 24 by tests
- Spartanburg
- 3,280
- Greenville
- 12,004
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Rank in SC
5 of 24
Top quarter
- Spartanburg
- 19.1%
- Oconee
- 42.6%
By share, of 24 with 30+ tests
Read a result for Spartanburg County
Starts at Spartanburg County's median, 1.7 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.7 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. Spartanburg County's median reported result, 2008 to 2017.
The data
Spartanburg County, At a glance
Spartanburg County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Spartanburg County is a
USGS geologic potential: Moderate across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Spartanburg County, 2008 to 2017, laboratory
Under 2 pCi/L: 55%2 to 4 pCi/L: 26%4 pCi/L and above: 19%
Of 3,280 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 1,803 | 55.0% |
| 2 to 4 pCi/L | 849 | 25.9% |
| 4 pCi/L and above | 628 | 19.1% |
What these figures count
These are the 3,280 tests reported to CDC for Spartanburg 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).
Spartanburg County, Compared
Spartanburg County radon figures, compared
Calculated by Radon411Spartanburg County's 3,280 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.7 pCi/L and a maximum of 42.4 pCi/L, and 19.1% reached 4 pCi/L. South Carolina as a whole (46 South Carolina counties, pooled) comes to 19.4%: 0.3 points higher than here.
Among its state's counties it ranks 5th of 24 South Carolina counties with 30 or more tests for the same period. Statewide for the same period, Oconee County reported the highest share (42.6%) and Florence County the lowest (0.0%).
Below the action level, 1,803 tests (55.0%) came in under 2 pCi/L, against 57.4% statewide, and 849 tests (25.9%) fell between 2 and 4, against 23.1% statewide. CDC's ten-year totals for Spartanburg County went from 2,425 tests (2005 to 2014) to 3,280 (2008 to 2017), the share going from 20.3% to 19.1%.
EPA's 1993 zone map puts Spartanburg County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.
Next door, the shares run from 13.7% in Cherokee County to 29.8% in Polk County, NC, with Laurens County and Cherokee County below Spartanburg County.
CDC also counts 63 tests taken after mitigation in Spartanburg County for the same period: tests in homes where a fix was already in.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Spartanburg County, Geology
The ground under Spartanburg County
PredictedUSGS's geologic map puts all of Spartanburg County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Inner Piedmont Belt, to which USGS gives a radon index of 11, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Inner Piedmont Belt | Proterozoic through Cambrian biotite gneiss and schist, and mica schist. | Moderate | 11 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Spartanburg County beside the ground around it
Across South Carolina 0.2% of the land is rated high; none of Spartanburg County's is. Of the 6 counties that border it, 1 has more high-potential ground, Rutherford County, NC the most at 0.3%.
The map rates the ground, not the air in any home.
Local help
Spartanburg County, Local resources
Radon testing and mitigation in Spartanburg 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.
What South Carolina's program says
- Phone
- 1-800-768-0362
- radon@des.sc.gov
What it means
Spartanburg County, Questions
Questions about radon in Spartanburg County
Are radon levels high in Spartanburg County?
Over the 2008 to 2017 laboratory totals, 19.1% of the radon tests reported to CDC for Spartanburg County, South Carolina were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.7 pCi/L. Of 24 South Carolina counties with 30 or more tests for the same period, 4 reported a higher share; pooled, the state comes to 19.4%.
Which counties border Spartanburg County?
Spartanburg County borders 6 counties: Greenville County, SC, Cherokee County, SC, Union County, SC, Laurens County, SC, Polk County, NC and Rutherford County, NC.
Products
Spartanburg County, Products
Testing a home in Spartanburg County
In Spartanburg County, 19.1% of 3,280 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 19.4% pooled across South Carolina. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Spartanburg County; a long-term test tells the year-round average.
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
MonitorAEGTEST
HOUND-1011 rechargeable radon detector with a screen
- 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
Spartanburg County, Bordering counties
Counties bordering Spartanburg County
Calculated by Radon411- Radon levels in Polk County, NCEPA zone 2
29.8%at or above 4 pCi/L
Median 2.4 pCi/L · 594 tests · 10.7 points above Spartanburg County
- Radon levels in Rutherford County, NCEPA zone 2
25.6%at or above 4 pCi/L
Median 2.4 pCi/L · 511 tests · 6.5 points above Spartanburg County
- Radon levels in Greenville County, SCEPA zone 1
19.6%at or above 4 pCi/L
Median 1.7 pCi/L · 12,004 tests · 0.5 points above Spartanburg County
- Radon levels in Laurens County, SCEPA zone 2
13.9%at or above 4 pCi/L
Median 1.3 pCi/L · 244 tests · 5.2 points below Spartanburg County
- Radon levels in Cherokee County, SCEPA zone 2
13.7%at or above 4 pCi/L
Median 1.6 pCi/L · 153 tests · 5.4 points below Spartanburg County
- Radon levels in Union County, SCEPA zone 3
0.0%at or above 4 pCi/L
Median 1.0 pCi/L · 27 tests · 19.1 points below Spartanburg County
Spartanburg County, Cities and towns
Cities and towns in Spartanburg County
Spartanburg County is growing: the Census Bureau puts it at 380,857 residents on July 1, 2025, up 15.6% from 329,370 in 2020. That works out to 471 people per square mile of land. Greer, the largest place on its list (50,007 residents in all), extends beyond Spartanburg County, so no share of the total is worked out for it. Testing is reported here more often than across the state: CDC's 3,280 reported tests for 2008 to 2017 come to 8.6 for every 1,000 residents (2025 estimate), against 4.8 for South Carolina.
From Greer to Central Pacolet, CDC publishes no figure by town: each reads Spartanburg County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Greerextends beyond Spartanburg County | 50,007 | +39.2% | Counted whole |
| Spartanburg | 39,978 | +3.6% | 10.5% |
| Lyman | 7,103 | +15.7% | 1.9% |
| Woodruff | 6,026 | +39.8% | 1.6% |
| Duncan | 4,675 | +15.6% | 1.2% |
| Wellford | 3,914 | +15.6% | 1.0% |
| Inman | 3,458 | +15.3% | 0.9% |
| Landrum | 2,865 | +15.5% | 0.8% |
| Pacolet | 2,644 | +15.7% | 0.7% |
| Cowpens | 2,257 | +11.2% | 0.6% |
| Reidville | 1,905 | +16.2% | 0.5% |
| Chesneeextends beyond Spartanburg County | 958 | +15.7% | Counted whole |
- Campobello
- Central Pacolet
14 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Spartanburg County is counted whole, so it has no share.
Spartanburg County, Homes
Homes in Spartanburg County
Of Spartanburg County's 141,086 homes, 72% are detached houses, against 64% across South Carolina; 12% are mobile homes. Half of its homes were built before 1989, close to South Carolina's 1991: 16% date from before 1960 and 33% from 2000 or later. 73% 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 | Spartanburg County | South Carolina |
|---|---|---|
| Housing units | 141,086 | 2,401,638 |
| Detached houses | 72% | 64% |
| In buildings of 5 or more | 8% | 13% |
| Mobile homes | 12% | 15% |
| Built before 1960 | 16% | 13% |
| Built since 2000 | 33% | 35% |
| Middle year built | 1989 | 1991 |
| Owner-occupied | 73% | 71% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.