County · South Carolina
Barnwell County, South Carolina: drinking water records
This overview covers 4 ZIP codes and 5 community water systems in Barnwell County. It also stands in for 0 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Barnwell Town of (Sc0610001) SC0610001 | 4,693 | 300 | 0 | 0 | 0.7 ppb |
| Williston Town of (Sc0610002) SC0610002 | 3,251 | 0 | 0 | 0 | 0.2 ppb |
| Blackville Town of (Sc0610003) SC0610003 | 1,934 | 0 | 0 | 0 | 7.5 ppb |
| Elko Town of (0610005) SC0610005 | 340 | 0 | 0 | 0 | 0.2 ppb |
| Hilda Town of (Sc0610004) SC0610004 | 318 | 0 | 0 | 0 | 0.2 ppb |
ZIP reports in Barnwell County
No ZIP report in this county is published yet.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.