165 public water systems in South Carolina were sampled in EPA's UCMR 5 programme (2023–2025); we show six PFAS and lithium. Read 2026-10-31.
69 of 165 systems had at least one sample above a 2024 federal limit; 101 had at least one PFAS found above the reporting level; 64 had none found above the reporting level.
A single sample above a 2024 limit is a measurement, not a violation. Compliance is judged on running yearly averages, and water systems have until 2029 to meet the limits. On 20 May 2026 EPA proposed giving qualifying systems until 2031 for PFOA and PFOS and removing the limits for PFHxS, PFNA and HFPO-DA; those proposals were not final when we last checked (5 Nov 2026). Counts are per system, not per person; population figures are available only for systems serving more than 25,000 people (about 3,447,055 people across those systems here). UCMR 5 was a one-time national monitoring programme (2023–2025). The results are a snapshot at the system's entry points or taps on the sample dates, not a continuous measurement and not a compliance record.
| System | People served | UCMR 5 result |
|---|---|---|
| Greenville Greenville Water (2310001) | 426,057 | None detected (below the reporting level) |
| Columbia Columbia City of (Sc4010001) | 354,068 | Above the 2024 limit in at least one sample |
Pages for these are being added in stages. The data for all 165 systems is in the public dataset.
| System | People served | UCMR 5 result |
|---|---|---|
| Charleston Water System (Sc1010001) Charleston Water System (Sc1010001) | 278,771 | Above the 2024 limit in at least one sample |
| Gsw&Sa (Sc2620004) Gsw&Sa (Sc2620004) | 252,840 | Above the 2024 limit in at least one sample |
| Spartanburg Water System (4210001) Spartanburg Water System (4210001) | 166,364 | None detected (below the reporting level) |
| Bjw&Sa (0720003) Bjw&Sa (0720003) | 164,829 | Above the 2024 limit in at least one sample |
| Bcwsa Sangaree W/D (0820002) Bcwsa Sangaree W/D (0820002) | 95,345 | Above the 2024 limit in at least one sample |
| Mt Pleasant Water Works (1010002) Mt Pleasant Water Works (1010002) | 91,500 | Above the 2024 limit in at least one sample |
| Rock Hill City of (Sc4610002) Rock Hill City of (Sc4610002) | 89,850 | None detected (below the reporting level) |
| Sjwd Middle Tyger Wtp (4220006) Sjwd Middle Tyger Wtp (4220006) | 89,531 | None detected (below the reporting level) |
| Summerville Cpw (Sc1810003) Summerville Cpw (Sc1810003) | 81,750 | Above the 2024 limit in at least one sample |
| Florence City of (Sc2110001) Florence City of (Sc2110001) | 79,745 | Above the 2024 limit in at least one sample |
| Lancaster County W&Sd (2920001) Lancaster County W&Sd (2920001) | 79,107 | None detected (below the reporting level) |
| Joint Municipal Wsc (3220003) Joint Municipal Wsc (3220003) | 54,868 | Above the 2024 limit in at least one sample |
| Greer Cpw (Sc2310005) Greer Cpw (Sc2310005) | 54,024 | None detected (below the reporting level) |
| Sumter City of (Sc4310001) Sumter City of (Sc4310001) | 53,070 | None detected (below the reporting level) |
| Darlington County W&Sa (1620001) Darlington County W&Sa (1620001) | 52,288 | None detected (below the reporting level) |
| Greenwood Cpw (2410001) Greenwood Cpw (2410001) | 52,022 | Above the 2024 limit in at least one sample |
| Aiken City of (0210001) Aiken City of (0210001) | 51,533 | Detected, below the 2024 limit |
| Myrtle Beach City of (Sc2610001) Myrtle Beach City of (Sc2610001) | 49,375 | Above the 2024 limit in at least one sample |
| Orangeburg Dpu (3810001) Orangeburg Dpu (3810001) | 47,463 | Above the 2024 limit in at least one sample |
| Laurens County W&S Comm (Sc3020001) Laurens County W&S Comm (Sc3020001) | 44,866 | Above the 2024 limit in at least one sample |
| N Myrtle Beach City of (Sc2610011) N Myrtle Beach City of (Sc2610011) | 43,883 | Above the 2024 limit in at least one sample |
| Goose Creek City of (0810004) Goose Creek City of (0810004) | 43,744 | Above the 2024 limit in at least one sample |
| Gcwsd Waccamaw Neck (Sc2220010) Gcwsd Waccamaw Neck (Sc2220010) | 41,300 | Above the 2024 limit in at least one sample |
| Inman Campobello W/D (4220002) Inman Campobello W/D (4220002) | 41,007 | None detected (below the reporting level) |
| Dcwa Knightsville (1820001) Dcwa Knightsville (1820001) | 40,141 | Above the 2024 limit in at least one sample |