No health-based violations on EPA record since 2016.
Serves about 32,547 people (8,991 connections) with groundwater from its own wells.
From EPA's record for CA3610043. PurityMap is independent of Golden State 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 March 2023 to September 2023.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 21.9 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 | 2023-03-21 to 2023-09-21 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| Perfluorooctanoic acid (PFOA) | 5.7 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| Perfluorohexanesulfonic acid (PFHxS) | 5 ng/L | 10 ng/L federal MCL (2024) | Within a historical reference; current applicability unverified | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| Perfluorohexanoic acid (PFHxA) | 5.4 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| Perfluoropentanoic acid (PFPeA) | 4.9 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| 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 | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| 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 | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| 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 | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| 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 | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| 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 | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| 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 | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-09-27 | UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043) |
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 Co's phone number on EPA record is 310-848-5505. Its mailing address is 13608 HITT ROAD, APPLE VALLEY, CA 92308.
According to EPA's record, Golden State Water Co uses groundwater from its own wells.
No health-based violations on EPA record since 2016. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Golden State Water Co's latest lead and copper round, which ended in December 2025, was 1.6 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Golden State Water Co. Its phone number on EPA record is 310-848-5505. Its mailing address on EPA record is 13608 HITT ROAD, APPLE VALLEY, CA 92308. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.