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 McCormick County, South Carolina
EPA puts McCormick County in Zone 3, its lowest radon zone, and only 10 radon tests from it are on file with CDC (2008 to 2017, laboratory totals). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
22.7%
Abbeville County
- Abbeville
- 22.7%
- Greenwood
- 7.1%
4 of 6 neighbours have 30+ tests, 2008 to 2017
Nearest county
7.1%
Greenwood County, 20 miles
- Greenwood
- 7.1%
- SC
- 19.4%
Share at 4+ pCi/L, 113 tests, 2008 to 2017
Ground above low
0.3%
18.2 pts below SC
- McCormick
- 0.3%
- SC
- 18.5%
Share of land USGS rates moderate or high potential
Tests reported
10
Too few for a share
- McCormick
- 10
- Needed
- 30
2008 to 2017, laboratory
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Read a result for McCormick County
Starts at EPA's action level
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.0 pCi/L
At or above 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher.
The data
McCormick County, At a glance
McCormick County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for McCormick County, 2008 to 2017, laboratory
CDC holds 10 reported tests for McCormick County over the 2008 to 2017 laboratory totals, with a median of 1.1 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). McCormick County beside the counties around it is how this page reads it.
What these figures count
Only 10 tests were reported to CDC for McCormick County over 2008 to 2017 (laboratory totals), and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor this house.
Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
McCormick County, Compared
McCormick County radon figures, compared
Calculated by Radon411CDC's largest figure for McCormick County rests on 10 tests over the 2008 to 2017 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 10.0 points and no rank or comparison is drawn from it. Results reached as high as 2.8 pCi/L, with a middle value of 1.1 pCi/L.
Of the counties bordering it, 4 have a figure over the 2008 to 2017 laboratory totals: Abbeville County reported the largest share at or above 4 pCi/L, 22.7%, and Greenwood County the smallest, 7.1%, with Elbert County, GA at 18.6% and Columbia County, GA at 11.1% between. Farther out, Laurens County (44 miles away) at 13.9%, Aiken County (46 miles away) at 13.3% and Anderson County (47 miles away) at 11.1% have figures too. Pooled across 46 South Carolina counties, 19.4% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Statewide for the same period, Oconee County reported the highest share (42.6%) and Florence County the lowest (0.0%). EPA's 1993 map puts McCormick County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 100% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
McCormick County, Geology
The ground under McCormick County
PredictedMost of the ground under McCormick County is one class on USGS's geologic map: 99.7% of its land is low radon potential, with 0.3% moderate. The map puts 53.1% of McCormick County in the area it calls Carolina Slate Belt and 35.9% in Charlotte Belt, with one smaller area beside them. USGS gives both a radon index of 8, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Carolina Slate Belt | amphibolite, granitic gneiss, quartzite, muscovite schist, meta-argillite, metavolcanic rocks. | Low | 8 | 53.1% |
| Charlotte Belt | Biotite gneiss and schist, metavolcanic rocks, mica gneiss. | Low | 8 | 35.9% |
| Little River Thrust Stack | Biotite and amphibolite gneiss, granite gneiss, mica schist. | Low | 7 | 10.5% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
McCormick County beside the ground around it
Across South Carolina 0.2% of the land is rated high; none of McCormick County's is. Of the 6 counties that border it, 4 have more moderate-potential ground, Elbert County, GA the most at 73.4%.
The map rates the ground, not the air in any home.
Local help
McCormick County, Local resources
Radon testing and mitigation in McCormick 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
McCormick County, Questions
Questions about radon in McCormick County
Are radon levels high in McCormick County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for McCormick County, South Carolina were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.1 pCi/L. Of the counties bordering it, 4 have a figure over the 2008 to 2017 laboratory totals: Abbeville County reported the largest share at or above 4 pCi/L, 22.7%, and Greenwood County the smallest, 7.1%, with Elbert County, GA at 18.6% and Columbia County, GA at 11.1% between.
Which counties border McCormick County?
McCormick County borders 6 counties: Lincoln County, GA, Edgefield County, SC, Columbia County, GA, Greenwood County, SC, Abbeville County, SC and Elbert County, GA.
Products
McCormick County, Products
Testing a home in McCormick County
No CDC figure names McCormick County; the nearest county with one, Greenwood County (20 miles away), reported 7.1% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, the only reading nearby until a test of this home. 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 McCormick 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
MonitorINKBIRD
INK-RD3 battery radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
McCormick County, Bordering counties
Counties bordering McCormick County
Calculated by Radon411- Radon levels in Edgefield County, SCEPA zone 3
25.0%at or above 4 pCi/L
Median 1.2 pCi/L · 12 tests
- Radon levels in Abbeville County, SCEPA zone 2
22.7%at or above 4 pCi/L
Median 1.8 pCi/L · 66 tests
- Radon levels in Elbert County, GAEPA zone 2
18.6%at or above 4 pCi/L
Median 1.9 pCi/L · 145 tests
- Radon levels in Columbia County, GAEPA zone 3
11.1%at or above 4 pCi/L
Median 0.9 pCi/L · 63 tests
- Radon levels in Greenwood County, SCEPA zone 3
7.1%at or above 4 pCi/L
Median 1.0 pCi/L · 113 tests
- Radon levels in Lincoln County, GAEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 1 test
McCormick County, Cities and towns
Cities and towns in McCormick County
McCormick County is growing: the Census Bureau puts it at 10,215 residents on July 1, 2025, up 7.3% from 9,522 in 2020. That works out to 28 people per square mile of land. No town dominates: McCormick, the largest, has 2,010 residents, 19.7% of the total. Together its 3 incorporated places hold 21.7% of those residents; the other 78.3% live outside any of them. Reported testing is thin here: 10 tests over 2008 to 2017, or 1.0 for every 1,000 residents (2025 estimate), where South Carolina as a whole comes to 4.8.
From McCormick to Plum Branch, CDC publishes no figure by town: each reads McCormick County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| McCormick | 2,010 | −9.7% | 19.7% |
| Parksville | 131 | +10.1% | 1.3% |
| Plum Branch | 80 | +3.9% | 0.8% |
3 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).
McCormick County, Homes
Homes in McCormick County
Of McCormick County's 5,563 homes, 71% are detached houses, against 64% across South Carolina; 21% are mobile homes. The homes are older than South Carolina's as a whole: half were built before 1982 (1991 for South Carolina), and 22% date from before 1960. Owners live in 84% of the occupied homes (South Carolina: 71%), so for most households a test and a fix are their own to order.
| Homes | McCormick County | South Carolina |
|---|---|---|
| Housing units | 5,563 | 2,401,638 |
| Detached houses | 71% | 64% |
| In buildings of 5 or more | 4% | 13% |
| Mobile homes | 21% | 15% |
| Built before 1960 | 22% | 13% |
| Built since 2000 | 24% | 35% |
| Middle year built | 1982 | 1991 |
| Owner-occupied | 84% | 71% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.