Tap Water Quality Report
Tap water quality in NORTH HEMPSTEAD (T), New York
Tap water in NORTH HEMPSTEAD (T), New York receives a grade of D (63/100) from TapWaterSafety.org. It's served by WA OF WESTERN NASSAU. The most significant water quality concerns are: PFAS contamination; Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in NORTH HEMPSTEAD (T)'s tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving NORTH HEMPSTEAD (T).
PFAS contamination
Severe concernPerfluorononanoic acid (PFNA), Perfluorooctane sulfonate (PFOS) 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 0.805 ppt, 805x above the EWG health guideline of 0.001 ppt.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 2.44 ppb, 41x above the EWG health guideline of 0.06 ppb.
EPA compliance record
Official U.S. EPA records for WA OF WESTERN NASSAU (system ID NY2902830) 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 NORTH HEMPSTEAD (T)
Filters matched to the specific contaminants in NORTH HEMPSTEAD (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. Look for NSF/ANSI 53 VOC 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 NORTH HEMPSTEAD (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 |
0.805 ppt | 0.001 | 10.0 | — | — | — | — | 805× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
2.44 ppb | 0.06 | — | — | — | — | — | 41× over |
| Perfluorononanoic acid (PFNA) PFAS |
0.213 ppt | 0.006 | 10.0 | — | — | — | — | 36× over |
| Radium, combined (-226 and -228) Radiological |
1.72 pCi/L | 0.05 | 5.0 | — | — | — | — | 34× over |
| Nitrate Inorganic |
3.56 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 25× over |
| Nitrate and nitrite Inorganic |
3.57 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 25× over |
| Perfluorooctanoic acid (PFOA) PFAS |
2.23 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 25× over |
| Chromium (hexavalent) Heavy metal |
0.248 ppb | 0.02 | — | — | — | — | — | 12× over |
| Uranium Radiological |
1.71 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 4.0× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
0.954 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | 3.2× over |
| 1,4-Dioxane Semi-volatile organic compound |
1.09 ppb | 0.35 | — | — | 50 | 1 | — | 3.1× over |
| Chlorate Disinfection byproduct |
356.8 ppb | 210.0 | — | — | — | — | — | 1.7× over |
| Dibromoacetic acid Disinfection byproduct |
0.0387 ppb | 0.03 | — | — | — | — | — | 1.3× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
0.187 ppb | 0.15 | 80.0 | 100 | — | — | — | 1.2× over |
| Dibromochloromethane Disinfection byproduct |
0.0915 ppb | 0.1 | — | — | — | — | — | Below guideline |
| Haloacetic acids (HAA5) Disinfection byproduct |
0.0522 ppb | 0.1 | 60.0 | 60 | — | — | — | Below guideline |
| Perchlorate Disinfection byproduct |
0.343 ppb | 1.0 | — | — | — | — | — | Below guideline |
| Bromodichloromethane Disinfection byproduct |
0.0199 ppb | 0.06 | — | — | — | — | — | Below guideline |
| Benzo[a]pyrene Other |
0.00111 ppb | 0.007 | 0.2 | — | — | — | — | Below guideline |
| Bromoform Disinfection byproduct |
0.0582 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Tetrachloroethylene (perchloroethylene) Volatile organic compound |
0.00485 ppb | 0.06 | 5.0 | — | — | — | — | Below guideline |
| Chloroform Disinfection byproduct |
0.0248 ppb | 0.4 | — | — | — | — | — | Below guideline |
| 6:2 Fluorotelomer sulfonate (6 2FTS) Other |
0.045 ppt | 1.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
2.73 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Barium Heavy metal |
16.5 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
3.33 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
3.06 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
2.14 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
0.0316 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
0.656 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.0119 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.35 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Picloram Other |
0.0161 ppb | 166.0 | 500.0 | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0854 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| 1,1-Dichloroethane Volatile organic compound |
7.5e-05 ppb | 3.0 | — | — | — | — | — | Below guideline |
| Xylenes (total) Volatile organic compound |
0.000976 ppb | 1800.0 | 10000.0 | — | — | — | — | Below guideline |
| Acetic acid Other |
2.22 ppb | — | — | 60 | — | — | — | Below guideline |
| Acetone Other |
0.879 ppb | — | — | — | — | — | — | Below guideline |
| Chlorodifluoromethane Other |
0.035 ppb | — | — | — | — | — | — | Below guideline |
| Dinoseb Pesticide/Herbicide |
0.0811 ppb | — | 7.0 | — | — | — | — | Below guideline |
| Formaldehyde Other |
1.5 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 WA OF WESTERN NASSAU.