San Jose Water Quality
California
According to EPA SDWIS, San Jose, California is served by 69 community water systems covering about 3,389,570 people. The same extract lists 93 health-based violation records, most recently coded 5200 in 2024. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in San Jose, California is delivered through 69 EPA-regulated community water systems serving an estimated 3,389,570 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 93 violation records across the 69 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 10 distinct EPA contaminant codes: LEAD AND COPPER RULE REVISIONS, Total Haloacetic Acids (HAA5), Surface Water Treatment Rule, Revised Total Coliform Rule, TTHM and 5 others. 27 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 |
|---|---|---|---|
| SAN JOSE WATER | 1,039,920 | 4 | Health |
| CWS - BAKERSFIELD | 267,881 | 0 | Clean |
| CALIFORNIA WATER SERVICE - STOCKTON | 176,266 | 0 | Clean |
| BAKERSFIELD, CITY OF | 160,144 | 0 | Clean |
| CALIFORNIA WATER SERVICE CO. - ELA | 152,474 | 0 | Clean |
| CWS - VISALIA | 148,496 | 0 | Clean |
| CALIFORNIA WATER SERVICE CO. - DOMINGUEZ | 143,996 | 0 | Clean |
| CWSC SALINAS | 123,679 | 0 | Clean |
| CAL-WATER SERVICE CO.-CHICO | 114,925 | 4 | Health |
| GREAT OAKS WC INC | 110,088 | 0 | Clean |
| CALIFORNIA WATER SERVICE - SAN MATEO | 102,348 | 2 | Health |
| CITY OF SAN JOSE - EVG/EDV/COY | 101,265 | 0 | Clean |
| CALIFORNIA WATER SERVICE CO. - HERM/REDO | 96,853 | 0 | Clean |
| CALIFORNIA WATER SERVICE CO. - PALOS VER | 71,452 | 0 | Clean |
| CWSC LOS ALTOS SUBURBAN | 69,973 | 2 | Health |
| CALIFORNIA WATER SERVICE-S SAN FRANCISCO | 64,146 | 3 | Health |
| CALIFORNIA WATER SERVICE - BEAR GULCH | 61,431 | 2 | Health |
| CALIFORNIA WATER SERVICE - LIVERMORE | 60,414 | 0 | Clean |
| CITY OF SAN JOSE - NSJ/ALVISO | 45,559 | 0 | Clean |
| HAWTHORNE-CITY WATER DEPT. | 44,718 | 0 | Clean |
| CALIFORNIA WATER SERVICE - SAN CARLOS | 35,344 | 3 | Health |
| CWS - SELMA | 26,517 | 0 | Clean |
| CWS - NORTH GARDEN | 22,762 | 0 | Clean |
| CALIFORNIA WATER SERVICE CO - WESTLAKE | 19,533 | 0 | Clean |
| CALIFORNIA WATER SERVICE CO.-TRAVIS AFB | 18,111 | 2 | Health |
| CITY OF CUPERTINO | 16,336 | 0 | Clean |
| CWSC KING CITY | 16,334 | 0 | Clean |
| CAL-WATER SERVICE CO.-MARYSVILLE | 12,419 | 0 | Clean |
| CAL-WATER SERVICE CO.-OROVILLE | 11,106 | 0 | Clean |
| CALIFORNIA WATER SERVICE CO. - DIXON | 10,623 | 0 | Clean |
| CAL-WATER SERVICE CO.-WILLOWS | 7,240 | 0 | Clean |
| CWSC SALINAS HILLS | 5,293 | 0 | Clean |
| COMMERCE-CITY, WATER DEPT. | 4,205 | 0 | Clean |
| TESORO VIEJO MASTER MWC, INC. | 3,885 | 0 | Clean |
| CWSC OAK HILLS | 3,161 | 0 | Clean |
| CWS - KERNVILLE | 2,572 | 48 | Health |
| LUCERNE WATER CO. - CAL WATER SERVICE | 2,129 | 0 | Clean |
| CWSC LAS LOMAS | 2,084 | 0 | Clean |
| CAL-WATER SERVICE CO.-HAMILTON CITY | 1,799 | 0 | Clean |
| CALIFORNIA WATER SERVICE CO.-LANCASTER | 1,387 | 0 | Clean |
| CWS SOUTHLAKE SYSTEM | 1,112 | 0 | Clean |
| WESTFIELD GARDEN MOBILE HOME PARK | 942 | 8 | Health |
| CALIFORNIA WATER SERVICE CO-LAKE HUGHES | 929 | 0 | Clean |
| CALIFORNIA WATER SERVICE CO-LEONA VALLEY | 878 | 0 | Clean |
| CWS - LOWER BODFISH WATER SYSTEM | 736 | 0 | Clean |
| CWS - TULCO WATER COMPANY | 716 | 0 | Clean |
| CEDAR GROVE MOBILE HOME PARK | 595 | 6 | Health |
| MISSION OAKS MOBILE HOME PARK | 550 | 0 | Clean |
| RIVERBEND MHP | 500 | 0 | Clean |
| ARMSTRONG VALLEY-CAL WATER SERVICE (PUC) | 473 | 0 | Clean |
| COAST SPRINGS - CAL. WATER SERVICE (PUC) | 388 | 0 | Clean |
| CWS - UPPER BODFISH WATER SYSTEM | 307 | 0 | Clean |
| MT. PLEASANT WATER USERS ASSOCIATION | 300 | 0 | Clean |
| CWS - LAKELAND | 294 | 6 | Health |
| CWS-ONYX WATER SYSTEM | 284 | 0 | Clean |
| CWS-SPLIT MOUNTAIN WATER SYSTEM | 226 | 0 | Clean |
| LONGHORN MOBILE HOME COMMUNITY | 220 | 0 | Clean |
| CWS - FREMONT VALLEY | 167 | 0 | Clean |
| BELLA LAGO MOBILE HOME PARK | 152 | 1 | Health |
| ROSEVIEW HEIGHTS MUTUAL WATER COMPANY | 148 | 1 | Health |
| KENNON WATER COMPANY | 142 | 1 | Health |
| CWS - MULLEN WATER COMPANY | 138 | 0 | Clean |
| CWS-GRAND OAKS WATER SYSTEM | 122 | 0 | Clean |
| RANCHO DEL PARADISO-CAL WATER SVC (PUC) | 94 | 0 | Clean |
| LAKE SAN ANTONIO MHP WS | 84 | 0 | Clean |
| HAWKINS WATER CO-CAL WATER SERVICE (PUC) | 81 | 0 | Clean |
| NOEL HEIGHTS-CAL WATER SERVICE (PUC) | 79 | 0 | Clean |
| ABORN HEIGHTS WATER MUTUAL ASSOCIATION | 45 | 0 | Clean |
| SANTA CLARA VALLEY WATER DISTRICT | 0 | 0 | Clean |
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 |
|---|---|---|
| CEDAR GROVE MOBILE HOME PARK | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| ROSEVIEW HEIGHTS MUTUAL WATER COMPANY | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| KENNON WATER COMPANY | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| BELLA LAGO MOBILE HOME PARK | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| CEDAR GROVE MOBILE HOME PARK | Total Haloacetic Acids (HAA5) | 2024-01-01 |
| CEDAR GROVE MOBILE HOME PARK | Total Haloacetic Acids (HAA5) | 2024-01-01 |
| CEDAR GROVE MOBILE HOME PARK | Total Haloacetic Acids (HAA5) | 2024-01-01 |
| SAN JOSE WATER | Surface Water Treatment Rule | 2023-06-01 |
| SAN JOSE WATER | Surface Water Treatment Rule | 2023-06-01 |
| SAN JOSE WATER | Surface Water Treatment Rule | 2023-06-01 |
| SAN JOSE WATER | Surface Water Treatment Rule | 2023-06-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2019-10-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2019-10-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2019-10-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2019-10-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2019-07-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2019-07-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2019-07-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2019-07-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2019-04-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2019-04-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2019-04-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2019-04-01 |
| CEDAR GROVE MOBILE HOME PARK | Revised Total Coliform Rule | 2019-01-11 |
| CEDAR GROVE MOBILE HOME PARK | Revised Total Coliform Rule | 2019-01-11 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2018-01-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2018-01-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2018-01-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2018-01-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2017-10-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2017-10-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2017-10-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2017-10-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2017-07-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2017-07-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2017-07-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2017-07-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2017-04-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2017-04-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2017-04-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2017-04-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2017-01-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2017-01-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2017-01-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2017-01-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2016-10-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2016-10-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2016-10-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2016-10-01 |
| CWS - KERNVILLE | Total Haloacetic Acids (HAA5) | 2016-07-01 |
What are San Jose's health-based records for?
San Jose'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 |
|---|---|---|
| Total Haloacetic Acids (HAA5) | 51 | 2 |
| Coliform (TCR) | 9 | 4 |
| Gross Alpha, Excl. Radon and U | 8 | 1 |
| Surface Water Treatment Rule | 7 | 2 |
| Lead and Copper Rule Revisions | 4 | 4 |
| Tetrachloroethylene | 4 | 1 |
| Fluoride | 3 | 1 |
| Combined Radium (-226 and -228) | 3 | 1 |
TRI Facilities in San Jose
| Facility | Total Releases |
|---|---|
| Clean Harbors San Jose LLC | 348.8K lbs |
| Gorilla Circuits | 328.0K lbs |
| Lumileds LLC | 152.4K lbs |
| Western Digital Technologies Inc | 24.6K lbs |
| Univar Solutions USA Inc - San Jose | 20.1K lbs |
| Quantumclean | 8.7K lbs |
| Ttm Technologies | 6.9K lbs |
| Sanmina Plant # 2 | 4.2K lbs |
| Equilon San Jose Terminal | 3.6K lbs |
| Sanmina-Plant # 1 | 2.5K lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in San Jose, California? ▼
How many water violations does San Jose have in this EPA extract? ▼
What contaminants were found in San Jose water? ▼
How many water systems serve San Jose? ▼
Where does San Jose get its drinking water? ▼
Are there pollution sources near San Jose? ▼
How does San Jose compare in California?
Of the 909 California places with at least one community water system on file, San Jose ranks #3 by number of systems (69).
Either side of it: Sacramento (74), Stockton (71), Salinas (55), Bakersfield (49)
About This Data
Figures here are the current EPA SDWIS extract joined to the 69 community water systems whose service area lists San Jose, 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.