Public Water Partners

STOCKTON, CA · San Joaquin County

RANCHO SAN JOAQUIN WATER SYS Water System

Consumer Confidence Report status

RANCHO SAN JOAQUIN WATER SYS 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 RANCHO SAN JOAQUIN WATER SYS.

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)
CA3900558
System type
Community Water System
Population served
172
Service connections
52
Ownership
local government
Water source
groundwater (wells)

RANCHO SAN JOAQUIN WATER SYS is one of 3,951 community water systems in California in the 500 or fewer people size category, serving 172 people from groundwater.

As of August 1, 2026, its federal record holds 1 entry in 1981, all of which EPA lists as closed. Nothing has been added since 1981.

All 1 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves the Radionuclides and Revised Rad Rule.

Violation history

  • Monitoring, Regular

    —

    Gross Alpha, Excl. Radon and U

    October 1, 1981 – September 30, 1982

    Archived

Archived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

No enforcement actions on record for this system.

Common questions

Is RANCHO SAN JOAQUIN WATER SYS required to publish a Consumer Confidence Report?

Yes. RANCHO SAN JOAQUIN WATER SYS 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 RANCHO SAN JOAQUIN WATER SYS’s next Consumer Confidence Report due?

RANCHO SAN JOAQUIN WATER SYS’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

Does RANCHO SAN JOAQUIN WATER SYS have any open drinking water violations on record?

As of August 1, 2026, EPA's federal records show no open violations for RANCHO SAN JOAQUIN WATER SYS.

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

MAINTENANCE DIST, SJC UTILITIES

209-468-3090

STOCKTON, CA 95205