PlainWater
States → California

GSWC-SAN DIMAS

PWS ID: CA1910142 · SAN DIMAS, California 91773

PFAS Detected

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

Population Served
56,538
Total Violations
5
Health-Based Violations
5
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Private
Connections
16,163
County
Los Angeles
School/Daycare
No
MCL Violations
5
Monitoring Violations
0
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Nitrate MCL 5 1997

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 3 of 300 samples detected PFAS.

Contaminant Date Result MRL Status
PFHpS 2/26/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 2/26/2025 <0.004 µg/L 0.004 µg/L Not Detected
ADONA 2/26/2025 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 2/26/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 2/26/2025 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 2/26/2025 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 2/26/2025 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 2/26/2025 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 2/26/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFPeA 2/26/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 2/26/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 2/26/2025 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 2/26/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFPeS 2/26/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFDoA 2/26/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 2/26/2025 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 2/26/2025 <0.007 µg/L 0.007 µg/L Not Detected
NFDHA 2/26/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFHpA 2/26/2025 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 2/26/2025 <0.006 µg/L 0.006 µg/L Not Detected
PFUnA 2/26/2025 <0.002 µg/L 0.002 µg/L Not Detected
NEtFOSAA 2/26/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBS 2/26/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 2/26/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 2/26/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 2/26/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 2/26/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 2/26/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 2/26/2025 <0.003 µg/L 0.003 µg/L Not Detected
lithium 2/26/2025 <9 µg/L 9 µg/L Not Detected
9Cl-PF3ONS 2/24/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFTA 2/24/2025 <0.008 µg/L 0.008 µg/L Not Detected
PFPeS 2/24/2025 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 2/24/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 2/24/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 2/24/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 2/24/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 2/24/2025 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 2/24/2025 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 2/24/2025 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 2/24/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 2/24/2025 <0.005 µg/L 0.005 µg/L Not Detected
lithium 2/24/2025 <9 µg/L 9 µg/L Not Detected
ADONA 2/24/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFTrDA 2/24/2025 <0.007 µg/L 0.007 µg/L Not Detected
11Cl-PF3OUdS 2/24/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 2/24/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 2/24/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 2/24/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 2/24/2025 <0.003 µg/L 0.003 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.