CITY OF STOCKTON
PWSID: CA3910012 · Stockton, CA · Serves 191,302 people
CITY OF STOCKTON has 18 health-based violations out of 18 total. Health violations indicate contaminant levels exceeded EPA limits or required treatment was not followed.
CITY OF STOCKTON (PWSID CA3910012) 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 191,302 people in Stockton, CA, and is subject to primacy enforcement by the California drinking-water program.
The system's federal compliance record contains 18 total violations, with 18 classified as health-based (MCL exceedances or treatment-technique failures). 3 distinct contaminants have been cited, including Total Trihalomethanes (TTHM), Arsenic, Gross Alpha. Recorded violations span 2013–2024.
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)
- CA3910012
- System Type
- CWS
- Water Source
- Surface Water
- Location
- Stockton, CA
- Population Served
- 191,302
- Health Violations
- Yes (18)
What contaminants are in this water system?
| Contaminant | Violations | Health-Based |
|---|---|---|
| Total Trihalomethanes (TTHM) | 14 | 14 |
| Arsenic | 3 | 3 |
| Gross Alpha | 1 | 1 |
Violation History (18)
| Contaminant | Health | Date |
|---|---|---|
| Gross Alpha | Yes | Oct 17, 2024 |
| Total Trihalomethanes (TTHM) | Yes | Apr 1, 2023 |
| Total Trihalomethanes (TTHM) | Yes | Apr 1, 2023 |
| Total Trihalomethanes (TTHM) | Yes | Apr 1, 2023 |
| Total Trihalomethanes (TTHM) | Yes | Apr 1, 2023 |
| Total Trihalomethanes (TTHM) | Yes | Apr 1, 2023 |
| Total Trihalomethanes (TTHM) | Yes | Jan 1, 2023 |
| Total Trihalomethanes (TTHM) | Yes | Jan 1, 2023 |
| Total Trihalomethanes (TTHM) | Yes | Jan 1, 2023 |
| Total Trihalomethanes (TTHM) | Yes | Jan 1, 2023 |
| Total Trihalomethanes (TTHM) | Yes | Jan 1, 2023 |
| Arsenic | Yes | Mar 1, 2016 |
| Arsenic | Yes | Mar 1, 2016 |
| Arsenic | Yes | Mar 1, 2016 |
| Total Trihalomethanes (TTHM) | Yes | Jan 1, 2013 |
| Total Trihalomethanes (TTHM) | Yes | Jan 1, 2013 |
| Total Trihalomethanes (TTHM) | Yes | Jan 1, 2013 |
| Total Trihalomethanes (TTHM) | Yes | Jan 1, 2013 |
Frequently Asked Questions
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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.