PlainWater
States → California

CITY OF CUPERTINO

PWS ID: CA4310018 · SAN JOSE, California 95128

Population Served
16,336
Total Violations
15
Health-Based Violations
15
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
4,692
County
Santa Clara
School/Daycare
No
MCL Violations
15
Monitoring Violations
0
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 15 1993

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 155 samples detected PFAS.

Contaminant Date Result MRL Status
NMeFOSAA 9/13/2023 <0.006 µg/L 0.006 µg/L Not Detected
PFTA 9/13/2023 <0.008 µg/L 0.008 µg/L Not Detected
NEtFOSAA 9/13/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 9/13/2023 <0.007 µg/L 0.007 µg/L Not Detected
NMeFOSAA 9/13/2023 <0.006 µg/L 0.006 µg/L Not Detected
PFTrDA 9/13/2023 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 9/13/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFTA 9/13/2023 <0.008 µg/L 0.008 µg/L Not Detected
11Cl-PF3OUdS 8/17/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFEESA 8/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 8/17/2023 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 8/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 8/17/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 8/17/2023 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 8/17/2023 <0.002 µg/L 0.002 µg/L Not Detected
4:2 FTS 8/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 8/17/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 8/17/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 8/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 8/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 8/17/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFMBA 8/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 8/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 8/17/2023 <0.002 µg/L 0.002 µg/L Not Detected
NFDHA 8/17/2023 <0.02 µg/L 0.02 µg/L Not Detected
lithium 8/17/2023 <9 µg/L 9 µg/L Not Detected
PFHxS 8/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFOS 8/17/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 8/17/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 8/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 8/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 8/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 8/17/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFEESA 8/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 8/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 8/17/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 8/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
lithium 8/17/2023 <9 µg/L 9 µg/L Not Detected
PFHpA 8/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 8/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 8/17/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 8/17/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 8/17/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 8/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 8/17/2023 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 8/17/2023 <0.005 µg/L 0.005 µg/L Not Detected
8:2 FTS 8/17/2023 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 8/17/2023 <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.