SAN JOSE, CA · Santa Clara County
CWSC LOS ALTOS SUBURBAN Water System
Consumer Confidence Report status
CWSC LOS ALTOS SUBURBAN 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 CWSC LOS ALTOS SUBURBAN.
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)
- CA4310001
- System type
- Community Water System
- Population served
- 69,973
- Service connections
- 18,530
- Ownership
- privately owned
- Water source
- surface water (rivers, lakes, or reservoirs)
CWSC LOS ALTOS SUBURBAN is one of 376 community water systems in California in the 10,001 to 100,000 people size category, serving 69,973 people from surface water.
As of August 1, 2026, its federal record holds 1 entry in 2002, all of which EPA lists as closed. Nothing has been added since 2002.
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 synthetic organic chemicals.
Violation history
Monitoring, Regular
—Simazine
January 1, 2002 – December 31, 2004
Resolved
Resolved addressed and confirmed by the state
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| January 1, 2002 – December 31, 2004 | Monitoring, Regular | Simazine | — | Resolved |
Resolved addressed and confirmed by the state
Enforcement actions
- January 25, 2019State Compliance achieved1 linked violation
- December 16, 2005State Compliance achieved1 linked violation
Common questions
Is CWSC LOS ALTOS SUBURBAN required to publish a Consumer Confidence Report?
- Yes. CWSC LOS ALTOS SUBURBAN 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 CWSC LOS ALTOS SUBURBAN’s next Consumer Confidence Report due?
- CWSC LOS ALTOS SUBURBAN’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does CWSC LOS ALTOS SUBURBAN have any open drinking water violations on record?
- As of August 1, 2026, EPA's federal records show no open violations for CWSC LOS ALTOS SUBURBAN.
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
JAMES, SOPHIE
408-367-8593
SAN JOSE, CA 95112