No health-based violations on EPA record since 2016.
Serves about 120,000 people (27,875 connections) with groundwater from its own wells.
From EPA's record for NY2902830. PurityMap is independent of Wa of Western Nassau.
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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 June 2023 to January 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorooctanoic acid (PFOA) | 10 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| Perfluorooctanesulfonic acid (PFOS) | 6.1 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| Perfluorohexanesulfonic acid (PFHxS) | 4.5 ng/L | 10 ng/L federal MCL (2024) | Within a historical reference; current applicability unverified | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| Perfluorobutanesulfonic acid (PFBS) | 3.6 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Within the referenced health-based guidance value | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| Perfluorohexanoic acid (PFHxA) | 7.4 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| Perfluorobutanoic acid (PFBA) | 7.1 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| Perfluoroheptanoic acid (PFHpA) | 3.4 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| Perfluoropentanoic acid (PFPeA) | 9.5 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| 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 | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| 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 | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| 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 | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| 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 | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| 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 | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| 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 | 2023-06-13 to 2023-12-07 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-13 to 2023-12-07 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-13 to 2023-12-07 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-13 to 2023-12-07 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-13 to 2023-12-07 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-13 to 2024-01-25 | UCMR5 Analytical Results: WA OF WESTERN NASSAU (NY2902830) |
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.
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Follow this water →Wa of Western Nassau's phone number on EPA record is 516-327-4053. Its mailing address is 1580 union tpke, NEW HYDE PARK, NY 11040.
According to EPA's record, Wa of Western Nassau uses groundwater from its own wells.
No health-based violations on EPA record since 2016. EPA also lists 1 missed or late test or report in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Wa of Western Nassau's latest lead and copper round, which ended in December 2024, was 1.4 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Wa of Western Nassau. Its phone number on EPA record is 516-327-4053. Its mailing address on EPA record is 1580 union tpke, NEW HYDE PARK, NY 11040. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.