SUFFOLK COUNTY WATER AUTHORITY
High Risk3 PFAS compound(s) exceed EPA Maximum Contaminant Levels
This utility has until 2029 to install treatment under the EPA's April 2024 PFAS rule. In the meantime, a point-of-use filter certified NSF/ANSI 58 for PFOA/PFOS provides reliable interim protection.
10
PFAS Detected
3
Above EPA Limits
79
ZIPs Served
Groundwater
Water Source
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 17.40ppt | 435% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 6.50ppt | 163% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 10.80ppt | 108% of limit
| 10 ppt | ⚠ Exceeds MCL |
PFNA Perfluorononanoic acid | 5.70ppt | 57% of limit
| 10 ppt | Below limit |
PFHxA Perfluorohexanoic acid | 43.50ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 39.40ppt | No federal limit | — | Unregulated |
6:2 FTS 6:2 Fluorotelomer sulfonic acid | 23.60ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 12.60ppt | No federal limit | — | Unregulated |
Show 2 more compounds detected at low levels
| PFHpAPerfluoroheptanoic acid | 9.60 ppt | No federal limit |
| PFBSPerfluorobutane sulfonic acid | 5.20 ppt | No federal limit |
ZIP Codes Served by This Utility
11701 11702 11703 11704 11705 11706 11713 11716 11717 11719 11720 11721 11722 11724 11725 11726 11727 11729 11730 11731 11733 11735 11738 11741 11742 11743 11746 11749 11751 11752 11754 11755 11757 11763 11764 11766 11767 11768 11769 11770 11772 11776 11777 11778 11779 11780 11782 11784 11786 11787 11788 11790 11795 11798 11901 11934 11935 11937 11939 11941 11942 11944 11949 11950 11952 11953 11954 11957 11958 11961 11963 11964 11965 11967 11968 11971 11976 11978 11980
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About this data
Source
EPA UCMR 5 — January 2026 release
Sampling period
January 2023 – December 2025
Water system ID (PWSID)
NY5110526
Detection threshold (MRL)
~1.5–2 ppt — "Not detected" means below this floor