South Carolina tap water
53 of 152 South Carolina water systems with full PFAS testing (35%) averaged above a 2024 federal PFAS level at one or more sampling points.
- 559 active community water systems in the EPA file; 144 serve 3,300+ people and have a full PFAS set.
- 75 systems had at least one health-based violation since 2021-10-26.
- 3 systems report a lead 90th percentile above 15 ppb (some results are old; check each system page).
Largest systems
| System | People served | PFAS above a 2024 level? | Health-based violations since 2021-10-26 |
|---|---|---|---|
| Greenville Water (Sc2310001) | 426,057 | No | 0 |
| Columbia City of (Sc4010001) | 354,068 | Yes, at one or more sampling points | 1 |
| Charleston Water System (Sc1010001) | 278,771 | Yes, at one or more sampling points | 2 |
| Grand Strand W&sa/Bull Creek | 252,840 | Yes, at one or more sampling points | 0 |
| Spartanburg Water System (Sc4210001) | 166,364 | No | 0 |
| Bjw&sa (Sc0720003) | 164,829 | Yes, at one or more sampling points | 1 |
| Mt Pleasant Waterworks (Sc1010002) | 91,500 | Yes, at one or more sampling points | 0 |
| Rock Hill City of (Sc4610002) | 89,850 | No | 0 |
Counties
All 23 utilities with a page in South Carolina
- Aiken City of (Sc0210001) 51,533
- Bjw&sa (Sc0720003) 164,829
- Charleston Water System (Sc1010001) 278,771
- Columbia City of (Sc4010001) 354,068
- Darlington County W&sa (Sc1620001) 52,288
- Florence City of (Sc2110001) 79,745
- Gcwsd Waccamaw Neck (Sc2220010) 41,300
- Grand Strand W&sa/Bull Creek 252,840
- Greenville Water (Sc2310001) 426,057
- Greenwood Cpw (2410001) 52,022
- Greer Cpw 54,024
- Joint Muni Wsc (Sc3220003) 54,868
- Lancaster County W&sd (Sc2920001) 79,107
- Laurens County W&s Comm (Sc3020001) 44,866
- Mt Pleasant Waterworks (Sc1010002) 91,500
- Myrtle Beach City of 49,375
- N Myrtle Beach City of (Sc2610011) 43,883
- Orangeburg Dpu (Sc3810001) 47,463
- Rock Hill City of (Sc4610002) 89,850
- Sjwd Middle Tyger Wtp (Sc4220006) 89,531
- Spartanburg Water System (Sc4210001) 166,364
- Summerville Cpw (Sc1810003) 81,750
- Sumter City of (Sc4310001) 53,070
Why not "the state's water quality"? You drink from one utility, not a state. Rollups count systems, not people, so one large utility counts the same as a small one. Use the system pages for your actual water.
Not medical or legal advice. UCMR 5 results are screening data, not compliance determinations.
Sources and freshness
Public-water-system facts, violations and lead/copper results: EPA ECHO SDWA download (SDWIS snapshot 2026-10-13). PFAS and lithium results: EPA UCMR 5 final data (sampling 2023–2025). Both are U.S. government works, downloaded 2026-10-26. Numbers are computed by the published method; the same fields are in the open data files.