Tap Water Quality Report
Tap water quality in HEMPSTEAD (T), New York
Tap water in HEMPSTEAD (T), New York receives a grade of D (60/100) from TapWaterSafety.org. It's served by 4 public water systems, primarily LIBERTY UTILITIES NEW YORK - MERRICK. The most significant water quality concerns are: PFAS contamination; Perfluoroundecanoic acid (PFUnA) significantly above health guideline; Nitrate significantly above health guideline; Nitrate and nitrite significantly above health guideline; Chromium (hexavalent) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in HEMPSTEAD (T)'s tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utilities serving HEMPSTEAD (T).
PFAS contamination
Severe concernPerfluorooctane sulfonate (PFOS), Perfluorooctanoic acid (PFOA) detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Perfluoroundecanoic acid (PFUnA) significantly above health guideline
Moderate concernPerfluoroundecanoic acid (PFUnA) detected at 0.072 ppt, 12x above the EWG health guideline of 0.006 ppt.
Nitrate significantly above health guideline
Moderate concernNitrate detected at 2.98 ppm, 21x above the EWG health guideline of 0.14 ppm.
Nitrate and nitrite significantly above health guideline
Moderate concernNitrate and nitrite detected at 2.95 ppm, 21x above the EWG health guideline of 0.14 ppm.
Chromium (hexavalent) significantly above health guideline
Moderate concernChromium (hexavalent) detected at 0.289 ppb, 14x above the EWG health guideline of 0.02 ppb.
Water systems serving HEMPSTEAD (T)
HEMPSTEAD (T) is served by 4 public water systems. Click any utility to see its complete grade card and treatment plant contact info.
LIBERTY UTILITIES NEW YORK - MERRICK
- PFAS contamination
- Perfluoroundecanoic acid (PFUnA) significantly above health guideline
TOWN OF HEMPSTEAD WATER DEPARTMENT
- PFAS contamination
- Nitrate significantly above health guideline
- Nitrate and nitrite significantly above health guideline
LIBERTY UTILITIES NEW YORK - LYNBROOK
- PFAS contamination
- Perfluorohexane sulfonate (PFHXS) significantly above health guideline
- Arsenic significantly above health guideline
WA OF WESTERN NASSAU
- PFAS contamination
- Perfluorohexane sulfonate (PFHXS) significantly above health guideline
- Haloacetic acids (HAA9) significantly above health guideline
Recommended filters for HEMPSTEAD (T)
Filters matched to the specific contaminants in HEMPSTEAD (T)'s water supply.
Reverse Osmosis or NSF P473 certified carbon
$80-$750Activated carbon and RO are the only technologies proven to remove PFAS at certified levels.
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 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 |
| Arsenic Heavy metal |
0.281 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 70× 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 |
0.289 ppb | 0.02 | — | — | — | — | — | 14× over |
| Perfluoroundecanoic acid (PFUnA) PFAS |
0.072 ppt | 0.006 | — | — | — | — | — | 12× over |
| Dibromoacetic acid Disinfection byproduct |
0.22 ppb | 0.03 | — | — | — | — | — | 7.3× over |
| Trichloroethylene Volatile organic compound |
2.3 ppb | 0.4 | 5.0 | 10 | 20 | 1.7 | — | 5.7× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
0.411 ppb | 0.1 | 60.0 | 60 | — | — | — | 4.1× 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 |
| Tetrachloroethylene (perchloroethylene) Volatile organic compound |
0.177 ppb | 0.06 | 5.0 | — | — | — | — | 3.0× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
0.443 ppb | 0.15 | 80.0 | 100 | — | — | — | 3.0× over |
| 6:2 Fluorotelomer sulfonate (6 2FTS) Other |
1.75 ppt | 1.0 | — | — | — | — | — | 1.8× over |
| Chlorate Disinfection byproduct |
356.8 ppb | 210.0 | — | — | — | — | — | 1.7× over |
| Dibromochloromethane Disinfection byproduct |
0.163 ppb | 0.1 | — | — | — | — | — | 1.6× over |
| Trichloroacetic acid Disinfection byproduct |
0.134 ppb | 0.1 | — | — | — | — | — | 1.3× over |
| Bromodichloromethane Disinfection byproduct |
0.0798 ppb | 0.06 | — | — | — | — | — | 1.3× over |
| Thallium Heavy metal |
0.132 ppb | 0.1 | 2.0 | — | — | — | — | 1.3× over |
| Manganese Heavy metal |
68.6 ppb | 100.0 | — | 50 | 80 | — | — | Fails EU |
| 4,8-dioxa-3H-perfluorononanoic acid (ADONA) PFAS |
0.435 ppt | 1.0 | — | — | — | — | — | Below guideline |
| Perchlorate Disinfection byproduct |
0.424 ppb | 1.0 | — | — | — | — | — | Below guideline |
| Chloroform Disinfection byproduct |
0.16 ppb | 0.4 | — | — | — | — | — | Below guideline |
| 1,2,3-Trichloropropane Other |
0.000223 ppb | 0.0007 | — | — | — | — | — | Below guideline |
| Bromoform Disinfection byproduct |
0.139 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Benzo[a]pyrene Other |
0.00111 ppb | 0.007 | 0.2 | — | — | — | — | Below guideline |
| 1,1-Dichloroethane Volatile organic compound |
0.369 ppb | 3.0 | — | — | — | — | — | Below guideline |
| Bromochloromethane Other |
0.00399 ppb | 0.06 | — | — | — | — | — | Below guideline |
| Cobalt Other |
1.88 ppb | 70.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
16.5 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| MTBE Volatile organic compound |
0.217 ppb | 13.0 | — | — | — | — | — | Below guideline |
| Beryllium Heavy metal |
0.0085 ppb | 1.0 | 4.0 | — | — | 1 | — | Below guideline |
| Vanadium Other |
0.166 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Chloromethane Other |
0.0155 ppb | 2.69 | — | — | — | — | — | Below guideline |
| Perfluoropentane sulfonic acid (PFPeS) PFAS |
0.005 ppt | 1.0 | — | — | — | — | — | 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 |
| Molybdenum Other |
0.055 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Mercury (inorganic) Heavy metal |
0.00135 ppb | 1.2 | 2.0 | 1 | 6 | 1.2 | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
0.656 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.0119 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Selenium Heavy metal |
0.0118 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | 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 |
| Trichlorotrifluoroethane Other |
0.0575 ppb | 4000.0 | — | — | — | — | — | Below guideline |
| Xylenes (total) Volatile organic compound |
0.000976 ppb | 1800.0 | 10000.0 | — | — | — | — | Below guideline |
| 1,1-Dichloroethylene Volatile organic compound |
0.0891 ppb | — | 7.0 | — | — | — | — | Below guideline |
| Chlorodifluoromethane Other |
0.072 ppb | — | — | — | — | — | — | Below guideline |
| cis-1,2-Dichloroethylene Volatile organic compound |
0.0621 ppb | — | 70.0 | — | — | — | — | Below guideline |
| Nitrite Inorganic |
0.000365 ppm | — | 1.0 | — | — | — | — | Below guideline |
| Acetic acid Other |
2.22 ppb | — | — | 60 | — | — | — | Below guideline |
| Acetone Other |
0.879 ppb | — | — | — | — | — | — | Below guideline |
| Dinoseb Pesticide/Herbicide |
0.0811 ppb | — | 7.0 | — | — | — | — | Below guideline |
| Formaldehyde Other |
1.5 ppb | — | — | — | — | — | — | Below guideline |
| Bromomethane Other |
0.000197 ppb | — | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
0.0438 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Cyanide Inorganic |
1.65 ppb | — | 200.0 | 50 | 70 | 150 | — | Below guideline |
| Dacthal Other |
1.2 ppb | — | — | — | — | — | — | Below guideline |
| Dalapon Pesticide/Herbicide |
0.0461 ppb | — | 200.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.0148 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
0.0256 ppb | — | — | — | — | — | — | Below guideline |
| Lithium Other |
11.6 ppb | — | — | — | — | — | — | Below guideline |
| Nonafluoro-3,6-dioxaheptanoic acid Other |
2.6e-05 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 LIBERTY UTILITIES NEW YORK - MERRICK.