No health-based violations on EPA record since 2016.
Serves about 4,644 people (2,132 connections) with surface water from its own intake, and buys water from Highlands Mutual Water Company.
From EPA's record for CA1710002. PurityMap is independent of Golden State Water Co.-Clearlake System.
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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 May 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 27.5 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 | 2023-03-22 to 2023-12-06 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| 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 | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| 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 | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| 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 | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| 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 | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| 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 | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-06 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-06 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| 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 | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-06 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-06 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-21 to 2024-05-08 | UCMR5 Analytical Results: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM (CA1710002) |
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.-Clearlake System's phone number on EPA record is 916-853-3632. Its mailing address is 3005 Gold Canal Drive, RANCHO CORDOVA, CA 95670.
According to EPA's record, Golden State Water Co.-Clearlake System uses surface water from its own intake, and buys water from Highlands Mutual Water Company.
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.-Clearlake System's latest lead and copper round, which ended in December 2026, was 4.1 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Golden State Water Co.-Clearlake System. Its phone number on EPA record is 916-853-3632. Its mailing address on EPA record is 3005 Gold Canal Drive, RANCHO CORDOVA, CA 95670. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.