CALIFORNIA WATER SERVICE - SAN MATEO
PWSID: CA4110008 · San Jose, CA · Serves 102,348 people
CALIFORNIA WATER SERVICE - SAN MATEO has 2 health-based violations out of 2 total. Health violations indicate contaminant levels exceeded EPA limits or required treatment was not followed.
CALIFORNIA WATER SERVICE - SAN MATEO (PWSID CA4110008) is a cws water system drawing from a surface water source, regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act. It serves approximately 102,348 people in San Jose, CA, and is subject to primacy enforcement by the California drinking-water program.
The system's federal compliance record contains 2 total violations, with 2 classified as health-based (MCL exceedances or treatment-technique failures). 1 distinct contaminant has been cited, including Total Coliform (RTCR). Recorded violations span 1992–1992.
A historical violation does not necessarily describe current water quality, systems must notify customers and remediate, and monitoring-type violations often reflect reporting lapses rather than contamination. The most authoritative real-time source is the utility's annual Consumer Confidence Report. For enforcement history and corrective-action orders, consult EPA ECHO and the California state drinking-water program's public portal.
System Details
- EPA ID (PWSID)
- CA4110008
- System Type
- CWS
- Water Source
- Surface Water
- Location
- San Jose, CA
- Population Served
- 102,348
- Health Violations
- Yes (2)
What contaminants are in this water system?
| Contaminant | Violations | Health-Based |
|---|---|---|
| Total Coliform (RTCR) | 2 | 2 |
Violation History (2)
| Contaminant | Health | Date |
|---|---|---|
| Total Coliform (RTCR) | Yes | Oct 1, 1992 |
| Total Coliform (RTCR) | Yes | Oct 1, 1992 |
Frequently Asked Questions
Is CALIFORNIA WATER SERVICE - SAN MATEO water safe to drink?
How many people does CALIFORNIA WATER SERVICE - SAN MATEO serve?
What violations does CALIFORNIA WATER SERVICE - SAN MATEO have?
What contaminants have been found in CALIFORNIA WATER SERVICE - SAN MATEO water?
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About This Data
Water system data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations that may pose a direct risk to public health. Violation records may span multiple years.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.