No health-based violations on EPA record since 2016.
Serves about 66,809 people (20,251 connections) with surface water bought from City of Thousand Oaks Water Department and Calleguas Municipal Water Dist.
From EPA's record for CA5610040. PurityMap is independent of Cal American Water 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 September 2023 to June 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 17.9 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 | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| 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 | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| 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 | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| 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 | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| 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 | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| 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 | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| 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 | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-18 to 2024-06-11 | UCMR5 Analytical Results: CAL AMERICAN WATER CO (CA5610040) |
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 →Cal American Water Co's phone number on EPA record is 626-614-2531. Its mailing address is 8657 Grand Ave., ROSEMEAD, CA 91770.
According to EPA's record, Cal American Water Co uses surface water bought from City of Thousand Oaks Water Department and Calleguas Municipal Water Dist.
No health-based violations on EPA record since 2016. EPA also lists 1 missed or late test or report in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Cal American Water Co's latest lead and copper round, which ended in December 2024, was 3 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Cal American Water Co. Its phone number on EPA record is 626-614-2531. Its mailing address on EPA record is 8657 Grand Ave., ROSEMEAD, CA 91770. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.