CITY OF STOCKTON
PWSID: CA3910012 · Stockton, CA · Serves 191,302 people
According to EPA Safe Drinking Water Information System (SDWIS), CITY OF STOCKTON (PWSID CA3910012) in Stockton, CA is listed as a CWS water system covering about 191,302 people. The same extract lists 17 health-based violation records spanning 2013-2023. Those 17 health-based rows for CITY OF STOCKTON cover contaminants such as TTHM, Surface Water Treatment Rule; they remain historical EPA registry entries, not a current compliance or drinkability score.
CITY OF STOCKTON has 17 health-based violation records in this historical extract. Monitoring and reporting records are not included.
PlainEnviro's health-based SDWIS extract covers monitoring and reporting violations only -- it does not include unresolved enforcement actions in progress or corrective steps a utility has taken since the extract date. 2 distinct EPA contaminant codes appear in this system's record, including TTHM, Surface Water Treatment Rule. Recorded violations span 2013–2023. Day-to-day primacy enforcement for this system runs through the California drinking-water program, not EPA directly.
A historical health-based record does not necessarily describe current water quality or compliance. The most authoritative current 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 (17)
What contaminants are in this water system?
| Contaminant | Violations | Health-Based |
|---|---|---|
| TTHM | 14 | 14 |
| Surface Water Treatment Rule | 3 | 3 |
Violation History (17)
| Contaminant | Health | Date |
|---|---|---|
| TTHM | Yes | Apr 1, 2023 |
| TTHM | Yes | Apr 1, 2023 |
| TTHM | Yes | Apr 1, 2023 |
| TTHM | Yes | Apr 1, 2023 |
| TTHM | Yes | Apr 1, 2023 |
| TTHM | Yes | Jan 1, 2023 |
| TTHM | Yes | Jan 1, 2023 |
| TTHM | Yes | Jan 1, 2023 |
| TTHM | Yes | Jan 1, 2023 |
| TTHM | Yes | Jan 1, 2023 |
| Surface Water Treatment Rule | Yes | Mar 1, 2016 |
| Surface Water Treatment Rule | Yes | Mar 1, 2016 |
| Surface Water Treatment Rule | Yes | Mar 1, 2016 |
| TTHM | Yes | Jan 1, 2013 |
| TTHM | Yes | Jan 1, 2013 |
| TTHM | Yes | Jan 1, 2013 |
| TTHM | Yes | Jan 1, 2013 |
Frequently Asked Questions
What does EPA SDWIS list for CITY OF STOCKTON?
How many people does CITY OF STOCKTON serve?
What violations does CITY OF STOCKTON have?
What contaminants have been found in CITY OF STOCKTON water?
Compare beyond California
Nationwide peers by violations & population served
Cross-state SDWIS systems nearest CITY OF STOCKTON on cumulative violation count (17) and EPA-reported population served (191,302). Violation-count peers include Colorado River Regional Water System, SOUTH TONGASS WATER UTILITY, DERMOTT WATERWORKS. Population peers include CITY OF GEORGETOWN, SYRACUSE CITY, CITY OF SHREVEPORT WATER SYSTEM.
Similar violation count
Nearest cross-state community systems (500+ served) by SDWIS violations on record.
Similar population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ gate).
Nearby Water Systems
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About This Data
CITY OF STOCKTON (CA3910012) is drawn from EPA SDWIS. Nearby county systems in this extract include TRACY, CITY OF; MANTECA, CITY OF; LODI, CITY OF; CITY OF LATHROP. Health-based rows (17 MCL/TT) are historical registry state, not a current drinkability score.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.