No health-based violations on EPA record since 2016.
Serves about 7,038 people (7,940 connections) with surface water from its own intake, and buys water from Clawa.
From EPA's record for CA3610005. PurityMap is independent of Lake Arrowhead 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 2023 to July 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorooctanoic acid (PFOA) | 14 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluorooctanesulfonic acid (PFOS) | 7.2 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluorononanoic acid (PFNA) | 4.6 ng/L | 10 ng/L federal MCL (2024) | Within a historical reference; current applicability unverified | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluorohexanesulfonic acid (PFHxS) | 3.3 ng/L | 10 ng/L federal MCL (2024) | Within a historical reference; current applicability unverified | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluorohexanoic acid (PFHxA) | 6.7 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluorodecanoic acid (PFDA) | 3.9 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluoroheptanoic acid (PFHpA) | 5.7 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluoropentanoic acid (PFPeA) | 4.5 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| 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 | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| 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 | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| 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 | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| 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 | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| 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 | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2023-02-07 to 2024-03-06 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-03-06 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-03-06 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| 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 | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-03-06 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-03-06 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
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 →Lake Arrowhead CSD's phone number on EPA record is 909-336-7102. Its mailing address is PO Box 700, LAKE ARROWHEAD, CA 92352.
According to EPA's record, Lake Arrowhead CSD uses surface water from its own intake, and buys water from Clawa.
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 Lake Arrowhead CSD'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 Lake Arrowhead CSD. Its phone number on EPA record is 909-336-7102. Its mailing address on EPA record is PO Box 700, LAKE ARROWHEAD, CA 92352. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.