No health-based violations on EPA record since 2016.
Serves about 31,400 people (8,345 connections) with groundwater from its own wells.
From EPA's record for NY2902841. PurityMap is independent of Wa of Great Neck North.
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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 September 2023 to September 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| 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 | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| 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 | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| 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 | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| 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 | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| 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 | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| 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 | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-10-18 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-10-18 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| 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 | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-10-18 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-10-18 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-20 to 2024-09-18 | UCMR5 Analytical Results: WA OF GREAT NECK NORTH (NY2902841) |
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 →Wa of Great Neck North's phone number on EPA record is 516-487-7973. Its mailing address is Water Authority of Great Neck North, 50 Water Mill Lane, GREAT NECK, NY 11021.
According to EPA's record, Wa of Great Neck North 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 Wa of Great Neck North's latest lead and copper round, which ended in December 2025, was 3 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Wa of Great Neck North. Its phone number on EPA record is 516-487-7973. Its mailing address on EPA record is Water Authority of Great Neck North, 50 Water Mill Lane, GREAT NECK, NY 11021. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.