Tap Water Quality Report
Tap water quality in EAST HAMPTON (T), New York
Tap water in EAST HAMPTON (T), New York receives a grade of C (72/100) from TapWaterSafety.org. It's served by SUFFOLK COUNTY WATER AUTHORITY. The most significant water quality concerns are: PFAS contamination; Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in EAST HAMPTON (T)'s tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving EAST HAMPTON (T).
PFAS contamination
Severe concernPerfluorononanoic acid (PFNA), Perfluorooctanoic acid (PFOA) detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Perfluorohexane sulfonate (PFHXS) significantly above health guideline
Moderate concernPerfluorohexane sulfonate (PFHXS) detected at 0.227 ppt, 227x above the EWG health guideline of 0.001 ppt.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 8.3 ppb, 55x above the EWG health guideline of 0.15 ppb.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 1.33 ppb, 22x above the EWG health guideline of 0.06 ppb.
EPA compliance record
Official U.S. EPA records for SUFFOLK COUNTY WATER AUTHORITY (system ID NY5110526) for the last 3 years. Checked 2026-10-07.
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for EAST HAMPTON (T)
Filters matched to the specific contaminants in EAST HAMPTON (T)'s water supply.
Filter certified for PFOA/PFOS (NSF/ANSI 53 or 58)
$180-$750Reverse osmosis and some carbon block filters reduce PFAS. Look for certification to NSF/ANSI 53 or 58 for PFOA/PFOS.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts like TTHM. Look for NSF/ANSI 53 VOC or chloroform reduction.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in EAST HAMPTON (T)'s tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Perfluorohexane sulfonate (PFHXS) PFAS |
0.227 ppt | 0.001 | 10.0 | — | — | — | — | 227× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
8.3 ppb | 0.15 | 80.0 | 100 | — | — | — | 55× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
1.33 ppb | 0.06 | — | — | — | — | — | 22× over |
| Chromium (hexavalent) Heavy metal |
0.414 ppb | 0.02 | — | — | — | — | — | 21× over |
| 1,2,3-Trichloropropane Other |
0.0126 ppb | 0.0007 | — | — | — | — | — | 18× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
1.15 ppb | 0.1 | 60.0 | 60 | — | — | — | 11× over |
| Perfluorononanoic acid (PFNA) PFAS |
0.024 ppt | 0.006 | 10.0 | — | — | — | — | 4.0× over |
| Perfluorooctanoic acid (PFOA) PFAS |
0.234 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 2.6× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
0.2 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.218 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Chlorate Disinfection byproduct |
57.8 ppb | 210.0 | — | — | — | — | — | Below guideline |
| 6:2 Fluorotelomer Sulfonic Acid (6:2 FTSA) Other |
0.09 ppt | 1.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
7.29 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| 1,1-Dichloroethane Volatile organic compound |
0.142 ppb | 3.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
0.206 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
0.935 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Cobalt Other |
0.0581 ppb | 70.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
0.747 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
0.14 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
0.0028 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
0.057 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0505 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.049 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Chlorodifluoromethane Other |
0.00778 ppb | — | — | — | — | — | — | Below guideline |
| Germanium Other |
0.0162 ppb | — | — | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from SUFFOLK COUNTY WATER AUTHORITY.