No health-based violations on EPA record since 2016.
Serves about 5,924 people (2,673 connections) with groundwater from its own wells.
From EPA's record for CA4010017. PurityMap is independent of Golden State Water Company.
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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 February 2023 to April 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 9.6 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 | 2023-02-06 to 2023-08-09 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| Perfluorohexanesulfonic acid (PFHxS) | 8.8 ng/L | 10 ng/L federal MCL (2024) | Within a historical reference; current applicability unverified | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| Perfluorobutanesulfonic acid (PFBS) | 3.2 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 | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| Perfluorohexanoic acid (PFHxA) | 4.3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| Perfluoropentanoic acid (PFPeA) | 3.4 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| 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 | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| 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 | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| 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 | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| 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 | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| 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 | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-06 to 2023-10-04 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-06 to 2023-10-04 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-06 to 2023-10-04 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-06 to 2023-10-04 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-06 to 2024-04-30 | UCMR5 Analytical Results: GOLDEN STATE WATER COMPANY - LOS OSOS (CA4010017) |
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 →Golden State Water Company's phone number on EPA record is 310-263-4141. Its mailing address is 14401 South Chadron Avenue, HAWTHORNE, CA 90250.
According to EPA's record, Golden State Water Company uses groundwater from its own wells.
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 Golden State Water Company'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 Golden State Water Company. Its phone number on EPA record is 310-263-4141. Its mailing address on EPA record is 14401 South Chadron Avenue, HAWTHORNE, CA 90250. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.