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PublicWater Watch

City of Hayward

Published drinking-water records and contacts for City of Hayward. System CA0110006. Review sources and dates; not a real-time water assessment.

System ID
CA0110006
State or territory
CA
Published population served
162954
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/L2025-12-15Mission San Jose Intertie / 0110006001
4:2 FTS< 0.003 µg/L0.003 µg/L2025-12-15Mission San Jose Intertie / 0110006001
6:2 FTS< 0.005 µg/L0.005 µg/L2025-12-15Mission San Jose Intertie / 0110006001
8:2 FTS< 0.005 µg/L0.005 µg/L2025-12-15Mission San Jose Intertie / 0110006001
9Cl-PF3ONS< 0.002 µg/L0.002 µg/L2025-12-15Newark Intertie / 0110006002
ADONA< 0.003 µg/L0.003 µg/L2025-12-15Mission San Jose Intertie / 0110006001
HFPO-DA< 0.005 µg/L0.005 µg/L2025-12-15Newark Intertie / 0110006002
NEtFOSAA< 0.005 µg/L0.005 µg/L2025-12-15Mission San Jose Intertie / 0110006001
NFDHA< 0.02 µg/L0.02 µg/L2025-12-15Mission San Jose Intertie / 0110006001
NMeFOSAA< 0.006 µg/L0.006 µg/L2025-12-15Mission San Jose Intertie / 0110006001
PFBA< 0.005 µg/L0.005 µg/L2025-12-15Mission San Jose Intertie / 0110006001
PFBS< 0.003 µg/L0.003 µg/L2025-12-15Mission San Jose Intertie / 0110006001
PFDA< 0.003 µg/L0.003 µg/L2025-12-15Mission San Jose Intertie / 0110006001
PFDoA< 0.003 µg/L0.003 µg/L2025-12-15Mission San Jose Intertie / 0110006001
PFEESA< 0.003 µg/L0.003 µg/L2025-12-15Mission San Jose Intertie / 0110006001
PFHpA< 0.003 µg/L0.003 µg/L2025-12-15Newark Intertie / 0110006002
PFHpS< 0.003 µg/L0.003 µg/L2025-12-15Newark Intertie / 0110006002
PFHxA< 0.003 µg/L0.003 µg/L2025-12-15Mission San Jose Intertie / 0110006001
PFHxS< 0.003 µg/L0.003 µg/L2025-12-15Newark Intertie / 0110006002
PFMBA< 0.003 µg/L0.003 µg/L2025-12-15Newark Intertie / 0110006002
PFMPA< 0.004 µg/L0.004 µg/L2025-12-15Newark Intertie / 0110006002
PFNA< 0.004 µg/L0.004 µg/L2025-12-15Mission San Jose Intertie / 0110006001
PFOA< 0.004 µg/L0.004 µg/L2025-12-15Newark Intertie / 0110006002
PFOS< 0.004 µg/L0.004 µg/L2025-12-15Mission San Jose Intertie / 0110006001
PFPeA< 0.003 µg/L0.003 µg/L2025-12-15Mission San Jose Intertie / 0110006001
PFPeS< 0.004 µg/L0.004 µg/L2025-12-15Mission San Jose Intertie / 0110006001
PFTA< 0.008 µg/L0.008 µg/L2025-12-15Mission San Jose Intertie / 0110006001
PFTrDA< 0.007 µg/L0.007 µg/L2025-12-15Newark Intertie / 0110006002
PFUnA< 0.002 µg/L0.002 µg/L2025-12-15Newark Intertie / 0110006002
lithium< 9 µg/L9 µg/L2025-12-15Mission San Jose Intertie / 0110006001

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/L2023-01-01 – 2025-12-312026Q3
Lead (PB90) 0 mg/L2020-01-01 – 2022-12-312026Q3
Lead (PB90) 0.0016 mg/L2017-01-01 – 2019-12-312026Q3
Lead (PB90) 0.0025 mg/L2014-01-01 – 2016-12-312026Q3
Lead (PB90) 0.0025 mg/L2011-01-01 – 2013-12-312026Q3
Lead (PB90) 0.0028 mg/L2008-01-01 – 2010-12-312026Q3
Lead (PB90) 0.0011 mg/L2005-01-01 – 2007-12-312026Q3
Lead (PB90) 0.0028 mg/L2006-01-01 – 2006-12-312026Q3
Twelve most recent imported state laboratory records
SubstancePublished resultSample dateLocation / source
DICHLOROACETIC ACID16.5 UG/L2026-04-15DBPR Sample / California DDW laboratory results
TOTAL HALOACETIC ACIDS (HAA5)40.6 UG/L2026-04-15DBPR Sample / California DDW laboratory results
MONOCHLOROACETIC ACID< 2.000000000 UG/L2026-04-15DBPR Sample / California DDW laboratory results
CHLOROFORM43.5 UG/L2026-04-15DBPR Sample / California DDW laboratory results
MONOBROMOACETIC ACID< 1.000000000 UG/L2026-04-15DBPR Sample / California DDW laboratory results
BROMODICHLOROMETHANE1.97 UG/L2026-04-15DBPR Sample / California DDW laboratory results
DICHLOROACETIC ACID20 UG/L2026-04-15DBPR Sample / California DDW laboratory results
BROMOFORM< 1.000000000 UG/L2026-04-15DBPR Sample / California DDW laboratory results
MONOBROMOACETIC ACID< 1.000000000 UG/L2026-04-15DBPR Sample / California DDW laboratory results
TOTAL HALOACETIC ACIDS (HAA5)35.2 UG/L2026-04-15DBPR Sample / California DDW laboratory results
BROMODICHLOROMETHANE2.17 UG/L2026-04-15DBPR Sample / California DDW laboratory results
DIBROMOACETIC ACID< 1.000000000 UG/L2026-04-15DBPR 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)

MuÑOz, Cheryl: 510-583-4701

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