PlainWater
States → California

CITY OF STOCKTON

PWS ID: CA3910012 · STOCKTON, California 95206

PFAS Detected

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

Population Served
191,302
Total Violations
24
Health-Based Violations
11
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
51,522
County
San Joaquin
School/Daycare
No
MCL Violations
8
Monitoring Violations
3
Treatment Tech Violations
3

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 6 2023
Consumer Confidence Rule Other 3 2001
Coliform (TCR) MCL 2 1999
Nitrate MR 2 2024
Surface Water Treatment Rule TT 2 2016
Coliform (TCR) Other 2 2005
LEAD AND COPPER RULE REVISIONS TT 1 2024
LEAD AND COPPER RULE REVISIONS RPT 1 2024
Lead and Copper Rule MR 1 2021

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 2 of 1050 samples detected PFAS.

Contaminant Date Result MRL Status
ADONA 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 8/6/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 8/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 8/6/2024 <0.002 µg/L 0.002 µg/L Not Detected
HFPO-DA 8/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHxA 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 8/6/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFDA 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 8/6/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFBA 8/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBS 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 8/6/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 8/6/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeS 8/6/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 8/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 8/6/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 8/6/2024 <0.008 µg/L 0.008 µg/L Not Detected
NFDHA 8/6/2024 <0.02 µg/L 0.02 µg/L Not Detected
lithium 8/6/2024 <9 µg/L 9 µg/L Not Detected
6:2 FTS 8/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFEESA 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 8/6/2024 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 8/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTrDA 8/29/2023 <0.007 µg/L 0.007 µg/L Not Detected
PFHxA 8/29/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 8/29/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 8/29/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 8/29/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 8/29/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 8/29/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 8/29/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/29/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 8/29/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 8/29/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 8/29/2023 <0.008 µg/L 0.008 µg/L Not Detected
HFPO-DA 8/29/2023 <0.005 µg/L 0.005 µg/L Not Detected
NEtFOSAA 8/29/2023 <0.005 µg/L 0.005 µg/L Not Detected
lithium 8/29/2023 <9 µg/L 9 µg/L Not Detected
PFHpS 8/29/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 8/29/2023 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 8/29/2023 <0.02 µg/L 0.02 µg/L Not Detected
NMeFOSAA 8/29/2023 <0.006 µg/L 0.006 µg/L Not Detected
PFMBA 8/29/2023 <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.