No health-based violations on EPA record since 2016.
Serves about 152,474 people (26,215 connections) with surface water bought from Metropolitan Water Dist. of So. Cal..
From EPA's record for CA1910036. PurityMap is independent of California Water Service Co..
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No health-based violations in the last 10 years, from EPA's SDWIS compliance database.
EPA required this system to test for 30 unregulated and emerging contaminants, from January 2025 to October 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 47.1 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Above the referenced health-based guidance value | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| Perfluorooctanesulfonic acid (PFOS) | 8.6 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| Perfluorobutanesulfonic acid (PFBS) | 4.9 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Within the referenced health-based guidance value | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| Perfluorohexanoic acid (PFHxA) | 7.6 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| Perfluorobutanoic acid (PFBA) | 8 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| Perfluoropentanoic acid (PFPeA) | 12.9 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| 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 | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| 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 | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| 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 | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| 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 | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| 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 | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-07 to 2025-10-15 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE CO. - ELA (CA1910036) |
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 →California Water Service Co.'s phone number on EPA record is 408-367-8490. Its mailing address is 1720 NORTH FIRST STREET, SAN JOSE, CA 95112.
According to EPA's record, California Water Service Co. uses surface water bought from Metropolitan Water Dist. of So. Cal..
No health-based violations on EPA record since 2016. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in California Water Service Co.'s latest lead and copper round, which ended in December 2023. The federal action level is 15 µg/L.
PurityMap has no verified website for California Water Service Co.. Its phone number on EPA record is 408-367-8490. Its mailing address on EPA record is 1720 NORTH FIRST STREET, SAN JOSE, CA 95112. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.