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PublicWater Watch

Town of Hillsborough

Published drinking-water records and contacts for Town of Hillsborough. System CA4110016. Review sources and dates; not a real-time water assessment.

System ID
CA4110016
State or territory
CA
Published population served
11766
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/L2024-12-04SFWD Intertie / 4110016001
4:2 FTS< 0.003 µg/L0.003 µg/L2024-12-04SFWD Intertie / 4110016001
6:2 FTS< 0.005 µg/L0.005 µg/L2024-12-04SFWD Intertie / 4110016001
8:2 FTS< 0.005 µg/L0.005 µg/L2024-12-04SFWD Intertie / 4110016001
9Cl-PF3ONS< 0.002 µg/L0.002 µg/L2024-12-04SFWD Intertie / 4110016001
ADONA< 0.003 µg/L0.003 µg/L2024-12-04SFWD Intertie / 4110016001
HFPO-DA< 0.005 µg/L0.005 µg/L2024-12-04SFWD Intertie / 4110016001
NEtFOSAA< 0.005 µg/L0.005 µg/L2024-11-13SFWD Intertie / 4110016001
NFDHA< 0.02 µg/L0.02 µg/L2024-12-04SFWD Intertie / 4110016001
NMeFOSAA< 0.006 µg/L0.006 µg/L2024-11-13SFWD Intertie / 4110016001
PFBA< 0.005 µg/L0.005 µg/L2024-12-04SFWD Intertie / 4110016001
PFBS< 0.003 µg/L0.003 µg/L2024-12-04SFWD Intertie / 4110016001
PFDA< 0.003 µg/L0.003 µg/L2024-12-04SFWD Intertie / 4110016001
PFDoA< 0.003 µg/L0.003 µg/L2024-12-04SFWD Intertie / 4110016001
PFEESA< 0.003 µg/L0.003 µg/L2024-12-04SFWD Intertie / 4110016001
PFHpA< 0.003 µg/L0.003 µg/L2024-12-04SFWD Intertie / 4110016001
PFHpS< 0.003 µg/L0.003 µg/L2024-12-04SFWD Intertie / 4110016001
PFHxA< 0.003 µg/L0.003 µg/L2024-12-04SFWD Intertie / 4110016001
PFHxS< 0.003 µg/L0.003 µg/L2024-12-04SFWD Intertie / 4110016001
PFMBA< 0.003 µg/L0.003 µg/L2024-12-04SFWD Intertie / 4110016001
PFMPA< 0.004 µg/L0.004 µg/L2024-12-04SFWD Intertie / 4110016001
PFNA< 0.004 µg/L0.004 µg/L2024-12-04SFWD Intertie / 4110016001
PFOA< 0.004 µg/L0.004 µg/L2024-12-04SFWD Intertie / 4110016001
PFOS< 0.004 µg/L0.004 µg/L2024-12-04SFWD Intertie / 4110016001
PFPeA< 0.003 µg/L0.003 µg/L2024-12-04SFWD Intertie / 4110016001
PFPeS< 0.004 µg/L0.004 µg/L2024-12-04SFWD Intertie / 4110016001
PFTA< 0.008 µg/L0.008 µg/L2024-11-13SFWD Intertie / 4110016001
PFTrDA< 0.007 µg/L0.007 µg/L2024-11-13SFWD Intertie / 4110016001
PFUnA< 0.002 µg/L0.002 µg/L2024-12-04SFWD Intertie / 4110016001
lithium< 9 µg/L9 µg/L2024-11-13SFWD Intertie / 4110016001

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) 0.0065 mg/L2020-01-01 – 2022-12-312026Q3
Lead (PB90) 0.007 mg/L2017-01-01 – 2019-12-312026Q3
Lead (PB90) 0.0058 mg/L2014-01-01 – 2016-12-312026Q3
Lead (PB90) 0.0104 mg/L2011-01-01 – 2013-12-312026Q3
Lead (PB90) 0.00841 mg/L2008-01-01 – 2010-12-312026Q3
Lead (PB90) 0.00461 mg/L2005-01-01 – 2007-12-312026Q3
Lead (PB90) 0.0078 mg/L2006-01-01 – 2006-12-312026Q3
Twelve most recent imported state laboratory records
SubstancePublished resultSample dateLocation / source
CHLOROFORM45 UG/L2026-05-05DBPR Sample / California DDW laboratory results
DICHLOROACETIC ACID17.4 UG/L2026-05-05DBPR Sample / California DDW laboratory results
TOTAL HALOACETIC ACIDS (HAA5)34 UG/L2026-05-05DBPR Sample / California DDW laboratory results
TTHM47.4 UG/L2026-05-05DBPR Sample / California DDW laboratory results
TOTAL HALOACETIC ACIDS (HAA5)38.2 UG/L2026-05-05DBPR Sample / California DDW laboratory results
BROMOFORM< 1.000000000 UG/L2026-05-05DBPR Sample / California DDW laboratory results
DIBROMOACETIC ACID< 1.000000000 UG/L2026-05-05DBPR Sample / California DDW laboratory results
DIBROMOACETIC ACID< 1.000000000 UG/L2026-05-05DBPR Sample / California DDW laboratory results
MONOCHLOROACETIC ACID< 2.000000000 UG/L2026-05-05DBPR Sample / California DDW laboratory results
BROMODICHLOROMETHANE2.23 UG/L2026-05-05DBPR Sample / California DDW laboratory results
TRICHLOROACETIC ACID18.3 UG/L2026-05-05DBPR Sample / California DDW laboratory results
CHLOROFORM46.3 UG/L2026-05-05DBPR 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)

Willis, Paul: 650-375-7487

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