No health-based violations on EPA record since 2016.
Serves about 6,235 people (2,518 connections) with groundwater from its own wells.
From EPA's record for CA1710015. PurityMap is independent of Hidden Valley Lake CSD.
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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 2025 to August 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 17.3 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 | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| 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 | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| 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 | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| 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 | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| 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 | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| 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 | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| 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 | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-06 | UCMR5 Analytical Results: HIDDEN VALLEY LAKE CSD (CA1710015) |
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 →Hidden Valley Lake CSD's phone number on EPA record is 707-987-9201. Its mailing address is 19400 Hartmann Road, HIDDEN VALLEY LAKE, CA 95467.
According to EPA's record, Hidden Valley Lake CSD 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 Hidden Valley Lake CSD'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 Hidden Valley Lake CSD. Its phone number on EPA record is 707-987-9201. Its mailing address on EPA record is 19400 Hartmann Road, HIDDEN VALLEY LAKE, CA 95467. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.