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City of Stockton

Published drinking-water records and contacts for City of Stockton. System CA3910012. Review sources and dates; not a real-time water assessment.

System ID
CA3910012
State or territory
CA
Published population served
191302
System type (source code)
CWS

Published records and dates

Missing records here do not mean the provider did not test. Published records are not a real-time assessment of your tap water.

Read the provider’s annual water quality report

Report link listed: 2026-10-05. This is not the report’s sampling date.

Published testing results

Selected recent records are shown below. Different sampling locations and dates are not interchangeable. These excerpts are not a complete testing history.

“<” means below the stated reporting limit, not zero. A reported measurement alone is not a safety verdict. Read an example

EPA UCMR 5 — most recent imported sample per substance
SubstancePublished resultReporting limitSample dateSampling location
11Cl-PF3OUdS< 0.005 µg/L0.005 µg/L2025-12-02Well 30 / 3910012829
4:2 FTS< 0.003 µg/L0.003 µg/L2025-12-02Well 28 / 3910012084
6:2 FTS< 0.005 µg/L0.005 µg/L2025-12-02Well 30 / 3910012829
8:2 FTS< 0.005 µg/L0.005 µg/L2025-12-02Well 28 / 3910012084
9Cl-PF3ONS< 0.002 µg/L0.002 µg/L2025-12-02Well 30 / 3910012829
ADONA< 0.003 µg/L0.003 µg/L2025-12-02Well SSS8 / 3910012831
HFPO-DA< 0.005 µg/L0.005 µg/L2025-12-02Well 28 / 3910012084
NEtFOSAA< 0.005 µg/L0.005 µg/L2025-12-02Well 30 / 3910012829
NFDHA< 0.02 µg/L0.02 µg/L2025-12-02Well 28 / 3910012084
NMeFOSAA< 0.006 µg/L0.006 µg/L2025-12-02Well SSS8 / 3910012831
PFBA< 0.005 µg/L0.005 µg/L2025-12-02Well 30 / 3910012829
PFBS0.0062 µg/L0.003 µg/L2025-12-02Well SSS8 / 3910012831
PFDA< 0.003 µg/L0.003 µg/L2025-12-02Well 30 / 3910012829
PFDoA< 0.003 µg/L0.003 µg/L2025-12-02Well 30 / 3910012829
PFEESA< 0.003 µg/L0.003 µg/L2025-12-02Well 28 / 3910012084
PFHpA< 0.003 µg/L0.003 µg/L2025-12-02Well SSS8 / 3910012831
PFHpS< 0.003 µg/L0.003 µg/L2025-12-02Well 28 / 3910012084
PFHxA< 0.003 µg/L0.003 µg/L2025-12-02Well 28 / 3910012084
PFHxS< 0.003 µg/L0.003 µg/L2025-12-02Well SSS8 / 3910012831
PFMBA< 0.003 µg/L0.003 µg/L2025-12-02Well SSS8 / 3910012831
PFMPA< 0.004 µg/L0.004 µg/L2025-12-02Well 30 / 3910012829
PFNA< 0.004 µg/L0.004 µg/L2025-12-02Well 28 / 3910012084
PFOA< 0.004 µg/L0.004 µg/L2025-12-02Well 30 / 3910012829
PFOS< 0.004 µg/L0.004 µg/L2025-12-02Well 28 / 3910012084
PFPeA< 0.003 µg/L0.003 µg/L2025-12-02Well 28 / 3910012084
PFPeS< 0.004 µg/L0.004 µg/L2025-12-02Well SSS8 / 3910012831
PFTA< 0.008 µg/L0.008 µg/L2025-12-02Well 28 / 3910012084
PFTrDA< 0.007 µg/L0.007 µg/L2025-12-02Well 30 / 3910012829
PFUnA< 0.002 µg/L0.002 µg/L2025-12-02Well 30 / 3910012829
lithium< 9 µg/L9 µg/L2025-12-02Well SSS8 / 3910012831

Download all EPA UCMR 5 records (CSV)

Lead and copper: 90th-percentile summaries

These describe a monitoring period across sampled locations, not the result at your home. How to read the 90th percentile

Eight most recent imported monitoring summaries
SubstancePublished 90th percentileMonitoring periodSource quarter
Lead (PB90) 0 mg/L2025-01-01 – 2027-12-312026Q3
Lead (PB90) 0 mg/L2024-01-01 – 2026-12-312026Q3
Lead (PB90) 0 mg/L2021-01-01 – 2023-12-312026Q3
Lead (PB90) 0 mg/L2018-01-01 – 2020-12-312026Q3
Lead (PB90) 0 mg/L2015-01-01 – 2017-12-312026Q3
Lead (PB90) 0 mg/L2014-01-01 – 2016-12-312026Q3
Lead (PB90) 0 mg/L2010-01-01 – 2012-12-312026Q3
Lead (PB90) 0 mg/L2008-01-01 – 2010-12-312026Q3
Twelve most recent imported state laboratory records
SubstancePublished resultSample dateLocation / source
ALKALINITY, TOTAL52 MG/L2026-06-08DWSP-SWTP-TREATED / California DDW laboratory results
HYDROXIDE AS CALCIUM CARBONATE< 5.000000000 MG/L2026-06-08DWSP-WID CANAL SOURCE - RAW / California DDW laboratory results
CARBON, TOTAL1.87 MG/L2026-06-08DWSP-SWTP-TREATED / California DDW laboratory results
CARBON, TOTAL2.00 MG/L2026-06-08DWSP-WID CANAL SOURCE - RAW / California DDW laboratory results
ALKALINITY, TOTAL47 MG/L2026-06-08DWSP-SWTP-TREATED / California DDW laboratory results
MANGANESE< 20.000000000 UG/L2026-06-08DWSP-SWTP-TREATED / California DDW laboratory results
ODOR8.9 TON2026-06-08DWSP-DELTA WATER SOURCE-RAW / California DDW laboratory results
TDS94 MG/L2026-06-08DWSP-SWTP-TREATED / California DDW laboratory results
ALKALINITY, TOTAL20 MG/L2026-06-08DWSP-WID CANAL SOURCE - RAW / California DDW laboratory results
ALKALINITY, CARBONATE< 5.000000000 MG/L2026-06-08DWSP-WID CANAL SOURCE - RAW / California DDW laboratory results
CONDUCTIVITY @ 25 C UMHOS/CM150 UMHO/CM2026-06-08DWSP-SWTP-TREATED / California DDW laboratory results
BROMATE< 5.000000000 UG/L2026-06-08DWSP-SWTP-TREATED / California DDW laboratory results

State sampling points can include untreated water. Publisher qualifiers and units are retained; consult the full source notes before interpreting a record.

Download state records with source notes (CSV)

Published compliance history

4 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.

Twenty most recent imported compliance records
Rule / recordPeriodRecorded statusHealth-based (EPA classification)Source quarter
Nitrate Rule / Monitoring, Regular2024-01-01 – 2024-12-31ResolvedNo2026Q3
Stage 2 Disinfectants and Disinfection Byproducts Rule / Maximum Contaminant Level Violation, Average2023-04-01 – 2023-06-30ResolvedYes2026Q3
Stage 2 Disinfectants and Disinfection Byproducts Rule / Maximum Contaminant Level Violation, Average2023-01-01 – 2023-03-31ResolvedYes2026Q3
Lead and Copper Rule / Follow-up Or Routine LCR Tap M/R2021-10-01 – —ResolvedNo2026Q3

Source dates and refresh checks

A refresh check is not a sample date. Publication periods, sample dates and checks are shown separately.

Administrative contact (EPA filing)

Lytle, Mel: 209-937-8438

An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.

Official state resources · How to read these records