What Areas in South Carolina Have the Highest Levels of Radon?
Greenville, Oconee, and Pickens counties in the Upstate region have the highest radon levels in South Carolina. These counties sit on uranium-rich bedrock, which naturally emits radon gas. Radon testing is essential, even outside these hotspots, because radon levels can vary from house to house.
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South Carolina’s Upstate region has the most consistently elevated radon readings. The highest-risk counties include:
- Greenville County: Over 12,000 radon tests, with average readings of 2.9 pCi/L
- Oconee County
- Pickens County
The state average is only 1.7 pCi/L, but elevated levels have been found in nearly every county.
Why Is Radon Higher in the Upstate Region?
The rock and soil in these counties contain more uranium and radium, which break down into radon gas.
Geological contributors include:
- Uranium-rich bedrock
- Porous soils that let radon move upward
- Mineral composition linked to higher emissions
These factors make radon seep more easily into homes through cracks and foundations.
Do You Need to Test for Radon If You Don’t Live in the Upstate?
Yes—radon can be high in any part of South Carolina, even outside known hotspots.
Radon levels are affected by:
- Local geology
- Home construction
- Seasonal ventilation patterns
Testing every 3 years is recommended by the South Carolina Department of Environmental Services (SCDES).
What Should You Do If Your Radon Levels Are High?
If radon levels reach or exceed 4.0 pCi/L, mitigation is strongly recommended.
Even at levels as low as 2.7 pCi/L, some health organizations advise action. Steps include:
- Retest after installation to confirm success
- Hire a certified mitigation contractor
- Install a sub-slab depressurization system
Why Is Radon Testing So Important for SC Homeowners?
Radon is odorless, invisible, and varies even between neighboring homes.
Without testing, you won’t know your risk. Regular testing can:
- Prevent long-term exposure to cancer-causing gas
- Help avoid stroke and blood issues linked to radon
- Provide peace of mind in any region of the state
Live in South Carolina? Schedule a professional radon test today to protect your home and family—especially if you’re in the Upstate or haven’t tested in the last 3 years.