No health-based violations on EPA record since 2016.
Serves about 22,762 people (8,353 connections) with surface water from its own intake, and buys water from Kern County Water Agency.
From EPA's record for CA1510055. PurityMap is independent of CWS.
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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 November 2024 to August 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 18.9 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 | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| Perfluorooctanesulfonic acid (PFOS) | 4.6 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| 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 | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| 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 | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| 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 | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| 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 | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| 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 | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| 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 | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-07 to 2025-08-23 | UCMR5 Analytical Results: CWS - NORTH GARDEN (CA1510055) |
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 →CWS's phone number on EPA record is 408-367-8593. Its mailing address is 1720 NORTH FIRST STREET, SAN JOSE, CA 95112.
According to EPA's record, CWS uses surface water from its own intake, and buys water from Kern County Water Agency.
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 CWS's latest lead and copper round, which ended in December 2024. The federal action level is 15 µg/L.
PurityMap has no verified website for CWS. Its phone number on EPA record is 408-367-8593. 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.