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States → Pennsylvania

CHESTER WATER AUTHORITY

PWS ID: PA1230004 · CHESTER, Pennsylvania 19016

PFAS Detected

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

Population Served
140,437
Total Violations
14
Health-Based Violations
0
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
44,371
County
Delaware
School/Daycare
No
MCL Violations
0
Monitoring Violations
4
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Nitrite MR 4 2011

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 13 of 120 samples detected PFAS.

Contaminant Date Result MRL Status
PFHpA 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 8/8/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 8/8/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 8/8/2024 0.0035 µg/L 0.003 µg/L Detected
PFOS 8/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 8/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
9Cl-PF3ONS 8/8/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFNA 8/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFMBA 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 8/8/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 8/8/2024 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 8/8/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 8/8/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFPeA 8/8/2024 0.0041 µg/L 0.003 µg/L Detected
PFEESA 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 8/8/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFPeS 8/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 8/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFTrDA 8/8/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 8/8/2024 <0.008 µg/L 0.008 µg/L Not Detected
NMeFOSAA 8/8/2024 <0.006 µg/L 0.006 µg/L Not Detected
lithium 8/8/2024 <9 µg/L 9 µg/L Not Detected
NEtFOSAA 8/8/2024 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 5/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHxA 5/6/2024 0.0039 µg/L 0.003 µg/L Detected
PFBA 5/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 5/6/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 5/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 5/6/2024 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 5/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 5/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 5/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 5/6/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 5/6/2024 0.0051 µg/L 0.004 µg/L Detected
PFDA 5/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 5/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 5/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMBA 5/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOS 5/6/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFBS 5/6/2024 0.0045 µg/L 0.003 µg/L Detected
PFMPA 5/6/2024 <0.004 µg/L 0.004 µg/L Not Detected
4:2 FTS 5/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
lithium 5/6/2024 <9 µg/L 9 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.