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California Water Service - San Carlos

Published drinking-water records and contacts for California Water Service - San Carlos. System CA4110007. Review sources and dates; not a real-time water assessment.

System ID
CA4110007
State or territory
CA
Published population served
35344
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.

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/L2025-01-08SFWD Intertie / 4110007001
4:2 FTS< 0.003 µg/L0.003 µg/L2025-01-08SFWD Intertie / 4110007001
6:2 FTS< 0.005 µg/L0.005 µg/L2025-01-08SFWD Intertie / 4110007001
8:2 FTS< 0.005 µg/L0.005 µg/L2025-01-08SFWD Intertie / 4110007001
9Cl-PF3ONS< 0.002 µg/L0.002 µg/L2025-01-08SFWD Intertie / 4110007001
ADONA< 0.003 µg/L0.003 µg/L2025-01-08SFWD Intertie / 4110007001
HFPO-DA< 0.005 µg/L0.005 µg/L2025-01-08SFWD Intertie / 4110007001
NEtFOSAA< 0.005 µg/L0.005 µg/L2025-01-08SFWD Intertie / 4110007001
NFDHA< 0.02 µg/L0.02 µg/L2025-01-08SFWD Intertie / 4110007001
NMeFOSAA< 0.006 µg/L0.006 µg/L2025-01-08SFWD Intertie / 4110007001
PFBA< 0.005 µg/L0.005 µg/L2025-01-08SFWD Intertie / 4110007001
PFBS< 0.003 µg/L0.003 µg/L2025-01-08SFWD Intertie / 4110007001
PFDA< 0.003 µg/L0.003 µg/L2025-01-08SFWD Intertie / 4110007001
PFDoA< 0.003 µg/L0.003 µg/L2025-01-08SFWD Intertie / 4110007001
PFEESA< 0.003 µg/L0.003 µg/L2025-01-08SFWD Intertie / 4110007001
PFHpA< 0.003 µg/L0.003 µg/L2025-01-08SFWD Intertie / 4110007001
PFHpS< 0.003 µg/L0.003 µg/L2025-01-08SFWD Intertie / 4110007001
PFHxA< 0.003 µg/L0.003 µg/L2025-01-08SFWD Intertie / 4110007001
PFHxS< 0.003 µg/L0.003 µg/L2025-01-08SFWD Intertie / 4110007001
PFMBA< 0.003 µg/L0.003 µg/L2025-01-08SFWD Intertie / 4110007001
PFMPA< 0.004 µg/L0.004 µg/L2025-01-08SFWD Intertie / 4110007001
PFNA< 0.004 µg/L0.004 µg/L2025-01-08SFWD Intertie / 4110007001
PFOA< 0.004 µg/L0.004 µg/L2025-01-08SFWD Intertie / 4110007001
PFOS< 0.004 µg/L0.004 µg/L2025-01-08SFWD Intertie / 4110007001
PFPeA< 0.003 µg/L0.003 µg/L2025-01-08SFWD Intertie / 4110007001
PFPeS< 0.004 µg/L0.004 µg/L2025-01-08SFWD Intertie / 4110007001
PFTA< 0.008 µg/L0.008 µg/L2025-01-08SFWD Intertie / 4110007001
PFTrDA< 0.007 µg/L0.007 µg/L2025-01-08SFWD Intertie / 4110007001
PFUnA< 0.002 µg/L0.002 µg/L2025-01-08SFWD Intertie / 4110007001
lithium< 9 µg/L9 µg/L2025-01-08SFWD Intertie / 4110007001

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) 0.0058 mg/L2022-01-01 – 2024-12-312026Q3
Lead (PB90) 0.0073 mg/L2019-01-01 – 2021-12-312026Q3
Lead (PB90) 0 mg/L2016-01-01 – 2018-12-312026Q3
Lead (PB90) 0 mg/L2014-01-01 – 2016-12-312026Q3
Lead (PB90) 0 mg/L2013-01-01 – 2015-12-312026Q3
Lead (PB90) 0.007 mg/L2007-01-01 – 2009-12-312026Q3
Lead (PB90) 0.0025 mg/L2006-01-01 – 2006-12-312026Q3
Lead (PB90) 0.0025 mg/L2004-01-01 – 2006-12-312026Q3
Twelve most recent imported state laboratory records
SubstancePublished resultSample dateLocation / source
DICHLOROACETIC ACID26 UG/L2026-05-06DBPR Sample / California DDW laboratory results
TRICHLOROACETIC ACID20 UG/L2026-05-06DBPR Sample / California DDW laboratory results
TTHM44 UG/L2026-05-06DBPR Sample / California DDW laboratory results
MONOBROMOACETIC ACID< 1.000000000 UG/L2026-05-06DBPR Sample / California DDW laboratory results
CHLOROFORM37 UG/L2026-05-06DBPR Sample / California DDW laboratory results
DICHLOROACETIC ACID26 UG/L2026-05-06DBPR Sample / California DDW laboratory results
CHLOROFORM41 UG/L2026-05-06DBPR Sample / California DDW laboratory results
TTHM42 UG/L2026-05-06DBPR Sample / California DDW laboratory results
DIBROMOACETIC ACID< 1.000000000 UG/L2026-05-06DBPR Sample / California DDW laboratory results
MONOCHLOROACETIC ACID< 2.000000000 UG/L2026-05-06DBPR Sample / California DDW laboratory results
MONOBROMOACETIC ACID< 1.000000000 UG/L2026-05-06DBPR Sample / California DDW laboratory results
BROMOFORM< 1.000000000 UG/L2026-05-06DBPR Sample / 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

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

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)

James, Sophie: 408-367-8593

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