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States → South Carolina

CHARLESTON WATER SYSTEM (SC1010001)

PWS ID: SC1010001 · CHARLESTON, South Carolina 29402-0017

PFAS Detected

5 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
327,422
Total Violations
22
Health-Based Violations
5
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
146,569
County
Charleston
School/Daycare
No
MCL Violations
5
Monitoring Violations
16
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 5 1984
Nitrate MR 4 1993
Cadmium MR 2 1993
Lead and Copper Rule MR 2 2002
Selenium MR 2 1993
Barium MR 2 1993
Chromium MR 2 1993
Coliform (TCR) MR 1 2004
Mercury MR 1 1993

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 15 of 90 samples detected PFAS.

Contaminant Date Result MRL Status
4:2 FTS 9/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 9/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 9/17/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 9/17/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 9/17/2025 <0.008 µg/L 0.008 µg/L Not Detected
PFHpS 9/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 9/17/2025 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 9/17/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 9/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 9/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 9/17/2025 0.0044 µg/L 0.003 µg/L Detected
PFMPA 9/17/2025 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 9/17/2025 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 9/17/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 9/17/2025 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 9/17/2025 <0.005 µg/L 0.005 µg/L Not Detected
lithium 9/17/2025 <9 µg/L 9 µg/L Not Detected
9Cl-PF3ONS 9/17/2025 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 9/17/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 9/17/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 9/17/2025 0.0039 µg/L 0.003 µg/L Detected
PFDoA 9/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 9/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 9/17/2025 0.0041 µg/L 0.004 µg/L Detected
PFOS 9/17/2025 0.0065 µg/L 0.004 µg/L Detected
PFNA 9/17/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 9/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 9/17/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 9/17/2025 0.0038 µg/L 0.003 µg/L Detected
NMeFOSAA 9/17/2025 <0.006 µg/L 0.006 µg/L Not Detected
PFHpA 6/16/2025 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 6/16/2025 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 6/16/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 6/16/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 6/16/2025 0.0043 µg/L 0.003 µg/L Detected
ADONA 6/16/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 6/16/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 6/16/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 6/16/2025 0.0041 µg/L 0.004 µg/L Detected
PFOS 6/16/2025 0.0052 µg/L 0.004 µg/L Detected
HFPO-DA 6/16/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFHxS 6/16/2025 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 6/16/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFBS 6/16/2025 0.0038 µg/L 0.003 µg/L Detected
PFNA 6/16/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFPeS 6/16/2025 <0.004 µg/L 0.004 µg/L Not Detected
lithium 6/16/2025 <9 µg/L 9 µg/L Not Detected
NMeFOSAA 6/16/2025 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 6/16/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 6/16/2025 <0.007 µg/L 0.007 µg/L Not Detected
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.