Stockton Water Quality
California
According to EPA SDWIS, Stockton, California is served by 71 community water systems covering about 224,402 people. The same extract lists 217 health-based violation records, most recently coded 2456 in 2025. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Stockton, California is delivered through 71 EPA-regulated community water systems serving an estimated 224,402 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 217 violation records across the 71 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 14 distinct EPA contaminant codes: Total Haloacetic Acids (HAA5), Nitrate, Arsenic, Revised Total Coliform Rule, Lead and Copper Rule and 9 others. 21 TRI-reporting industrial facilities are also located within the city limits.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the California drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| CITY OF STOCKTON | 191,302 | 17 | Health |
| SAN JOAQUIN COUNTY - LINCOLN VILLAGE | 5,841 | 0 | Clean |
| CDCR CALIFORNIA HEALTH CARE FACILITY | 5,551 | 16 | Health |
| SAN JOAQUIN COUNTY-MOKELUMNE ACRES | 3,802 | 0 | Clean |
| SAN JOAQUIN COUNTY - COLONIAL HEIGHTS | 1,841 | 0 | Clean |
| OAKWOOD LAKE WATER DISTRICT-SUBDIVISION | 1,479 | 0 | Clean |
| FAIROAKS PWS #44 | 1,172 | 0 | Clean |
| SAN JOAQUIN COUNTY-RAYMUS VILLAGE | 1,086 | 19 | Health |
| SAN JOAQUIN COUNTY - THORNTON | 964 | 0 | Clean |
| SAN JOAQUIN COUNTY - WILKINSON MANOR | 851 | 0 | Clean |
| STOCKTON VERDE MOBILE HOME PARK | 711 | 1 | Health |
| SNOWSHOE SPRINGS ASSN. | 686 | 3 | Health |
| MORADA ESTATES N PWS #46 | 426 | 0 | Clean |
| BEL AIR MOBILE ESTATE | 325 | 0 | Clean |
| SANTOS RANCH PWS #5-CSA #35 | 320 | 0 | Clean |
| SAN JOAQUIN WATER WORKS #2 | 310 | 0 | Clean |
| MORADA ESTATES PWS | 290 | 0 | Clean |
| PEPPERMINT CREEK MHP | 280 | 1 | Health |
| ROUGH & READY VILLAGE | 268 | 0 | Clean |
| CLEMENTS WATER WORKS #43 | 264 | 0 | Clean |
| RIVERLAND MOBILEHOME PARK | 260 | 0 | Clean |
| CAL 20 VILLAGE AND MEADOW POINTE PARK | 255 | 0 | Clean |
| SHADED TERRACE PWS | 238 | 0 | Clean |
| TWIN OAKS MOBILE PARK | 238 | 0 | Clean |
| KING ISLAND TRAILER PARK WATER SYSTEM | 236 | 0 | Clean |
| ELKHORN ESTATES WATER SYSTEM | 234 | 0 | Clean |
| ACAMPO WATER SYSTEM | 231 | 0 | Clean |
| CAPELL VALLEY ESTATES | 208 | 5 | Health |
| CASA DE AMIGOS MANUFACTURED HOUSING COMM | 204 | 0 | Clean |
| SAN JUAN VISTA | 201 | 0 | Clean |
| BETHEL ISLAND MHC | 185 | 0 | Clean |
| CARIBOU MOBILE PARK PWS | 180 | 0 | Clean |
| GAYLA MANOR PWS | 178 | 0 | Clean |
| PAR COUNTRY ESTATES CSA-16 | 178 | 0 | Clean |
| WESTERN MOBILE HOME PARK | 178 | 1 | Health |
| RANCHO SAN JOAQUIN WATER SYS | 172 | 0 | Clean |
| PLAZA MOBILE HOME PARK | 169 | 1 | Health |
| SECURITY MHP | 150 | 1 | Health |
| FAIRWAY ESTATES PWS CSA-18 | 149 | 0 | Clean |
| MULBERRY MHP | 148 | 0 | Clean |
| CORRAL HOLLOW PWS | 145 | 0 | Clean |
| GOLD BEACH PARK | 134 | 8 | Health |
| MOBILE VILLAS TRAILER PARK | 130 | 0 | Clean |
| WILKINSON MANOR A-ZONE PWS | 125 | 0 | Clean |
| QUIET OAKS MOBILE HOME PARK | 120 | 102 | Health |
| BIG WHEEL MOBILE HOME PARK | 120 | 1 | Health |
| AMBERWOOD ESTATES, LLC | 120 | 0 | Clean |
| SPRING CREEK ESTATES PWS | 119 | 0 | Clean |
| MORADA MANOR WATER SYSTEM | 112 | 2 | Health |
| DEL RIO EAST HOA WATER SYSTEM | 110 | 0 | Clean |
| WALNUT ACRES | 106 | 0 | Clean |
| MORADA ACRES WATER SYSTEM | 105 | 0 | Clean |
| CHERRY LANE TRAILER PARK | 100 | 0 | Clean |
| DESERT MOBILE HOME ESTATES | 100 | 3 | Health |
| MAURLAND MANOR WATER SYSTEM | 92 | 0 | Clean |
| A1 WINSTONS MOBILE HOME PARK | 75 | 1 | Health |
| WAYSIDE MOTEL APARTMENTS WTR SYS | 70 | 0 | Clean |
| SUNNYSIDE ESTATES WATER SYSTEM | 69 | 0 | Clean |
| MARY LOU MOBILE HOME PARK | 68 | 0 | Clean |
| EVERGREEN MOBILE ESTATES | 65 | 0 | Clean |
| FOREST POINT MHC | 62 | 0 | Clean |
| OAKMONT WATER SYSTEM | 61 | 0 | Clean |
| ALMOND PARK WATER SYSTEM | 60 | 0 | Clean |
| EL RIO MOBILE HOME PARK | 60 | 0 | Clean |
| RENO SAHARA TRAILER PARK | 60 | 0 | Clean |
| 15TH AVENUE | 50 | 0 | Clean |
| STOCKTON EAST WATER DISTRICT | 50 | 1 | Health |
| WINE COUNTRY APARTMENTS | 40 | 0 | Clean |
| ENCLAVE AT THE DELTA | 39 | 2 | Health |
| FREMONT ONE | 39 | 24 | Health |
| V & P TRAILER COURT WATER SYSTEM | 35 | 8 | Health |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| PEPPERMINT CREEK MHP | Total Haloacetic Acids (HAA5) | 2025-10-01 |
| FREMONT ONE | Nitrate | 2025-10-01 |
| V & P TRAILER COURT WATER SYSTEM | Arsenic | 2025-10-01 |
| FREMONT ONE | Nitrate | 2025-07-01 |
| V & P TRAILER COURT WATER SYSTEM | Arsenic | 2025-07-01 |
| V & P TRAILER COURT WATER SYSTEM | Revised Total Coliform Rule | 2025-06-01 |
| V & P TRAILER COURT WATER SYSTEM | Revised Total Coliform Rule | 2025-06-01 |
| V & P TRAILER COURT WATER SYSTEM | Revised Total Coliform Rule | 2025-05-01 |
| V & P TRAILER COURT WATER SYSTEM | Revised Total Coliform Rule | 2025-05-01 |
| DESERT MOBILE HOME ESTATES | Lead and Copper Rule | 2025-04-01 |
| FREMONT ONE | Nitrate | 2025-04-01 |
| V & P TRAILER COURT WATER SYSTEM | Revised Total Coliform Rule | 2025-04-01 |
| V & P TRAILER COURT WATER SYSTEM | Revised Total Coliform Rule | 2025-04-01 |
| SAN JOAQUIN COUNTY-RAYMUS VILLAGE | Nitrate | 2025-01-01 |
| FREMONT ONE | Nitrate | 2025-01-01 |
| QUIET OAKS MOBILE HOME PARK | Nitrate | 2025-01-01 |
| WESTERN MOBILE HOME PARK | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| PLAZA MOBILE HOME PARK | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| A1 WINSTONS MOBILE HOME PARK | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| CAPELL VALLEY ESTATES | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| SAN JOAQUIN COUNTY-RAYMUS VILLAGE | Nitrate | 2024-10-01 |
| SAN JOAQUIN COUNTY-RAYMUS VILLAGE | Nitrate | 2024-10-01 |
| FREMONT ONE | Nitrate | 2024-10-01 |
| FREMONT ONE | Nitrate | 2024-10-01 |
| QUIET OAKS MOBILE HOME PARK | Nitrate | 2024-10-01 |
| QUIET OAKS MOBILE HOME PARK | Nitrate | 2024-10-01 |
| SAN JOAQUIN COUNTY-RAYMUS VILLAGE | Nitrate | 2024-07-01 |
| SAN JOAQUIN COUNTY-RAYMUS VILLAGE | Nitrate | 2024-07-01 |
| FREMONT ONE | Nitrate | 2024-07-01 |
| FREMONT ONE | Nitrate | 2024-07-01 |
| QUIET OAKS MOBILE HOME PARK | Nitrate | 2024-07-01 |
| QUIET OAKS MOBILE HOME PARK | Nitrate | 2024-07-01 |
| SAN JOAQUIN COUNTY-RAYMUS VILLAGE | Nitrate | 2024-04-01 |
| SAN JOAQUIN COUNTY-RAYMUS VILLAGE | Nitrate | 2024-04-01 |
| FREMONT ONE | Nitrate | 2024-04-01 |
| FREMONT ONE | Nitrate | 2024-04-01 |
| QUIET OAKS MOBILE HOME PARK | Nitrate | 2024-04-01 |
| QUIET OAKS MOBILE HOME PARK | Nitrate | 2024-04-01 |
| SAN JOAQUIN COUNTY-RAYMUS VILLAGE | Nitrate | 2024-01-01 |
| SAN JOAQUIN COUNTY-RAYMUS VILLAGE | Nitrate | 2024-01-01 |
| FREMONT ONE | Nitrate | 2024-01-01 |
| FREMONT ONE | Nitrate | 2024-01-01 |
| FREMONT ONE | Nitrate | 2024-01-01 |
| QUIET OAKS MOBILE HOME PARK | Nitrate | 2024-01-01 |
| SAN JOAQUIN COUNTY-RAYMUS VILLAGE | Nitrate | 2023-10-01 |
| SAN JOAQUIN COUNTY-RAYMUS VILLAGE | Nitrate | 2023-10-01 |
| FREMONT ONE | Nitrate | 2023-10-01 |
| FREMONT ONE | Nitrate | 2023-10-01 |
| QUIET OAKS MOBILE HOME PARK | Nitrate | 2023-10-01 |
| QUIET OAKS MOBILE HOME PARK | Nitrate | 2023-10-01 |
What are Stockton's health-based records for?
Stockton's health-based violation records carry 8 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Nitrate | 127 | 3 |
| Tthm | 31 | 3 |
| Nitrate-Nitrite | 18 | 1 |
| Arsenic | 10 | 2 |
| Revised Total Coliform Rule | 7 | 2 |
| Coliform (TCR) | 6 | 3 |
| Lead and Copper Rule Revisions | 4 | 4 |
| Total Haloacetic Acids (HAA5) | 3 | 2 |
TRI Facilities in Stockton
| Facility | Total Releases |
|---|---|
| Tesoro - Stockton Terminal | 8.5K lbs |
| Pacific Ethanol Stockton LLC | 7.6K lbs |
| Gcp Applied Technologies Inc | 1.8K lbs |
| Canary Renewables Corp | 1.4K lbs |
| Equilon Stockton Terminal | 1.3K lbs |
| Thatcher Co of California Inc | 926 lbs |
| Schuff Steel Co | 814 lbs |
| Concrete Inc | 590 lbs |
| Gaf Materials Mfg LLC | 484 lbs |
| Valimet Inc | 270 lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Stockton, California? ▼
How many water violations does Stockton have in this EPA extract? ▼
What contaminants were found in Stockton water? ▼
How many water systems serve Stockton? ▼
Where does Stockton get its drinking water? ▼
Are there pollution sources near Stockton? ▼
How does Stockton compare in California?
Of the 909 California places with at least one community water system on file, Stockton ranks #2 by number of systems (71).
Either side of it: Sacramento (74), San Jose (69), Salinas (55)
About This Data
Figures here are the current EPA SDWIS extract joined to the 71 community water systems whose service area lists Stockton, ranked against the 909 California places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.