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States → California

NORWALK - CITY, WATER DEPT.

PWS ID: CA1910191 · NORWALK, California 90650

PFAS Detected

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

Population Served
20,283
Total Violations
2
Health-Based Violations
2
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
5,401
County
Los Angeles
School/Daycare
No
MCL Violations
2
Monitoring Violations
0
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
1,2-Dichloroethane MCL 2 1999

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 31 of 600 samples detected PFAS.

Contaminant Date Result MRL Status
PFHxA 8/26/2024 <0.003 µg/L 0.003 µg/L Not Detected
4:2 FTS 8/26/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 8/26/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 8/26/2024 <0.004 µg/L 0.004 µg/L Not Detected
NMeFOSAA 8/26/2024 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 8/26/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 8/26/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 8/26/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFHpS 8/26/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 8/26/2024 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 8/26/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 8/26/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 8/26/2024 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 8/26/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHxS 8/26/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 8/26/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 8/26/2024 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 8/26/2024 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 8/26/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 8/26/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 8/26/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 8/26/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFDoA 8/26/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 8/26/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 8/26/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 8/26/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 8/26/2024 <0.003 µg/L 0.003 µg/L Not Detected
lithium 8/26/2024 43.0000 µg/L 9 µg/L Detected
PFMBA 8/26/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 8/26/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 8/26/2024 0.0049 µg/L 0.004 µg/L Detected
PFBA 8/26/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMBA 8/26/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 8/26/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 8/26/2024 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 8/26/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 8/26/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 8/26/2024 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 8/26/2024 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 8/26/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 8/26/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 8/26/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 8/26/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFEESA 8/26/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOS 8/26/2024 0.0220 µg/L 0.004 µg/L Detected
NMeFOSAA 8/26/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFDA 8/26/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 8/26/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 8/26/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeS 8/26/2024 <0.004 µg/L 0.004 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.