CHARLESTON WATER SYSTEM (SC1010001)
High Risk2 PFAS compound(s) exceed EPA Maximum Contaminant Levels
This utility has until 2029 to install treatment under the EPA's April 2024 PFAS rule. In the meantime, a point-of-use filter certified NSF/ANSI 58 for PFOA/PFOS provides reliable interim protection.
5
PFAS Detected
2
Above EPA Limits
33
ZIPs Served
Surface
Water Source
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 6.50ppt | 163% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 4.40ppt | 110% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFPeA Perfluoropentanoic acid | 4.70ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 4.30ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 3.80ppt | No federal limit | — | Unregulated |
ZIP Codes Served by This Utility
29401 29403 29404 29405 29406 29407 29409 29410 29412 29414 29418 29420 29424 29425 29426 29429 29439 29445 29449 29450 29451 29455 29456 29461 29464 29466 29470 29482 29483 29485 29486 29487 29492
Click any ZIP to see the full result page for that area.
About this data
Source
EPA UCMR 5 — January 2026 release
Sampling period
January 2023 – December 2025
Water system ID (PWSID)
SC1010001
Detection threshold (MRL)
~1.5–2 ppt — "Not detected" means below this floor