Public Water Partners

SOUTH SAN FRANCISCO, CA · San Mateo County

WESTBOROUGH WATER DISTRICT Water System

Consumer Confidence Report status

WESTBOROUGH WATER DISTRICT must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.

As of August 1, 2026, EPA's federal records show no open violations for WESTBOROUGH WATER DISTRICT.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace California’s official records. Always confirm current status with California before making decisions based on this information.

System facts

System ID (PWSID)
CA4110027
System type
Community Water System
Population served
13,486
Service connections
3,907
Ownership
local government
Water source
surface water (rivers, lakes, or reservoirs)

WESTBOROUGH WATER DISTRICT is one of 376 community water systems in California in the 10,001 to 100,000 people size category, serving 13,486 people from surface water.

As of August 1, 2026, its federal record holds 1 entry in 1991, all of which EPA lists as closed. Nothing has been added since 1991.

None of the 1 are monitoring or reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset; these involve water-quality, treatment, or public-notice findings instead. The record involves the Surface Water Treatment Rules.

Violation history

  • Treatment Technique (SWTR and GWR)

    Health-based

    Surface Water Treatment Rule

    October 1, 1991 – July 31, 1998

    Resolved

Resolved addressed and confirmed by the state

Enforcement actions

No enforcement actions on record for this system.

Common questions

Is WESTBOROUGH WATER DISTRICT required to publish a Consumer Confidence Report?

Yes. WESTBOROUGH WATER DISTRICT is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.

When is WESTBOROUGH WATER DISTRICT’s next Consumer Confidence Report due?

WESTBOROUGH WATER DISTRICT’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

Does WESTBOROUGH WATER DISTRICT have any open drinking water violations on record?

As of August 1, 2026, EPA's federal records show no open violations for WESTBOROUGH WATER DISTRICT.

What is a Consumer Confidence Report?

A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Contact

MAIRENA, PATRICIA

650-589-1435

SOUTH SAN FRANCISCO, CA 94080