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States → California

DOWNEY - CITY, WATER DEPT.

PWS ID: CA1910034 · DOWNEY, California 90241

PFAS Detected

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

Population Served
108,816
Total Violations
16
Health-Based Violations
6
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
23,459
County
Los Angeles
School/Daycare
No
MCL Violations
4
Monitoring Violations
6
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 4 2008
E. COLI MR 3 2012
Coliform (TCR) MR 3 2013
Revised Total Coliform Rule TT 2 2018

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 71 of 300 samples detected PFAS.

Contaminant Date Result MRL Status
ADONA 7/1/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 7/1/2025 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 7/1/2025 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 7/1/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFUnA 7/1/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFDoA 7/1/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 7/1/2025 0.0110 µg/L 0.004 µg/L Detected
PFOS 7/1/2025 0.0140 µg/L 0.004 µg/L Detected
PFNA 7/1/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFBS 7/1/2025 0.0089 µg/L 0.003 µg/L Detected
PFHxS 7/1/2025 0.0037 µg/L 0.003 µg/L Detected
11Cl-PF3OUdS 7/1/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 7/1/2025 0.0074 µg/L 0.005 µg/L Detected
PFHpA 7/1/2025 0.0042 µg/L 0.003 µg/L Detected
PFTrDA 7/1/2025 <0.007 µg/L 0.007 µg/L Not Detected
6:2 FTS 7/1/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFHxA 7/1/2025 0.0210 µg/L 0.003 µg/L Detected
NMeFOSAA 7/1/2025 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 7/1/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFTA 7/1/2025 <0.008 µg/L 0.008 µg/L Not Detected
lithium 7/1/2025 <9 µg/L 9 µg/L Not Detected
PFHpS 7/1/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 7/1/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFMPA 7/1/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFEESA 7/1/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 7/1/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 7/1/2025 0.0270 µg/L 0.003 µg/L Detected
4:2 FTS 7/1/2025 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 7/1/2025 <0.02 µg/L 0.02 µg/L Not Detected
8:2 FTS 7/1/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFNA 7/1/2025 <0.004 µg/L 0.004 µg/L Not Detected
ADONA 7/1/2025 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 7/1/2025 <0.02 µg/L 0.02 µg/L Not Detected
NMeFOSAA 7/1/2025 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 7/1/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 7/1/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFHpS 7/1/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 7/1/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 7/1/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 7/1/2025 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 7/1/2025 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 7/1/2025 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 7/1/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFHxA 7/1/2025 0.0140 µg/L 0.003 µg/L Detected
HFPO-DA 7/1/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBS 7/1/2025 0.0072 µg/L 0.003 µg/L Detected
9Cl-PF3ONS 7/1/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFPeS 7/1/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 7/1/2025 0.0190 µg/L 0.003 µg/L Detected
PFUnA 7/1/2025 <0.002 µg/L 0.002 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.