No open health-based violations on EPA record in the last 10 years.
Serves about 1,039,920 people (237,130 connections) with surface water from its own intake, and buys water from City of Cupertino and Santa Clara Valley Water District.
From EPA's record for CA4310011. PurityMap is independent of San Jose Water.
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1 health-based violation in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From June 2023 | Surface Water Treatment Rule | – | – | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from February 2023 to February 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorooctanesulfonic acid (PFOS) | 6.2 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| Lithium | 10 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Within the referenced health-based guidance value | 2023-02-15 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| Perfluorohexanesulfonic acid (PFHxS) | 5.5 ng/L | 10 ng/L federal MCL (2024) | Within a historical reference; current applicability unverified | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-16 to 2025-02-11 | UCMR5 Analytical Results: SAN JOSE WATER (CA4310011) |
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Get PurityMap updates about this water system.
Follow this water →San Jose Water's phone number on EPA record is 408-918-7254. Its mailing address is 1221A South Bascom Avenue, SAN JOSE, CA 95128.
According to EPA's record, San Jose Water uses surface water from its own intake, and buys water from City of Cupertino and Santa Clara Valley Water District.
EPA's record shows 1 health-based violation for San Jose Water in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. EPA also lists 1 missed or late test or report in 10 years. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in San Jose Water's latest lead and copper round, which ended in December 2025. The federal action level is 15 µg/L.
PurityMap has no verified website for San Jose Water. Its phone number on EPA record is 408-918-7254. Its mailing address on EPA record is 1221A South Bascom Avenue, SAN JOSE, CA 95128. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.