Water Quality Report · Updated May 12, 2026
LIBERTY UTILITIES NEW YORK - MERRICK
LIBERTY UTILITIES NEW YORK - MERRICK delivers tap water graded C (72/100) by TapWaterSafety.org. The utility serves approximately 135,000 residents in HEMPSTEAD (T), New York using groundwater. The most significant water quality concerns are: PFAS contamination; Perfluoroundecanoic acid (PFUnA) significantly above health guideline. For questions, the utility can be reached at 516-632-2218.
Is HEMPSTEAD (T) tap water safe to drink?
LIBERTY UTILITIES NEW YORK - MERRICK delivers tap water that earns a grade of C (72/100) from TapWaterSafety.org — an average rating, with several contaminants above health guidelines but generally compliant with US legal limits.
The utility serves 135,000 residents in HEMPSTEAD (T), drawing from groundwater.
Public testing data identifies 11 contaminants in this water above EWG's health-based guidelines, including: Perfluoroundecanoic acid (PFUnA), Radium, combined (-226 and -228), Trichloroethylene, Haloacetic acids (HAA9), Chromium (hexavalent), 6:2 Fluorotelomer sulfonate (6 2FTS), Total trihalomethanes (TTHMs), Perfluorooctanoic acid (PFOA), 1,4-Dioxane, Thallium, Bromodichloromethane. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
Quick actions for HEMPSTEAD (T) residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for LIBERTY UTILITIES NEW YORK - MERRICK.
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.
Contact LIBERTY UTILITIES NEW YORK - MERRICK
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for HEMPSTEAD (T)
Filters matched to the specific contaminants in this 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.
Score breakdown
This utility's overall score of 72/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). 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 |
|---|---|---|---|---|---|---|---|---|
| Perfluoroundecanoic acid (PFUnA) PFAS |
0.072 ppt | 0.006 | — | — | — | — | — | 12× over |
| Radium, combined (-226 and -228) Radiological |
0.42 pCi/L | 0.05 | 5.0 | — | — | — | — | 8.4× over |
| Trichloroethylene Volatile organic compound |
2.3 ppb | 0.4 | 5.0 | 10 | 20 | 1.7 | — | 5.7× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
0.289 ppb | 0.06 | — | — | — | — | — | 4.8× over |
| Chromium (hexavalent) Heavy metal |
0.044 ppb | 0.02 | — | — | — | — | — | 2.2× over |
| 6:2 Fluorotelomer sulfonate (6 2FTS) Other |
1.75 ppt | 1.0 | — | — | — | — | — | 1.8× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
0.232 ppb | 0.15 | 80.0 | 100 | — | — | — | 1.5× over |
| Perfluorooctanoic acid (PFOA) PFAS |
0.13 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 1.4× over |
| 1,4-Dioxane Semi-volatile organic compound |
0.467 ppb | 0.35 | — | — | 50 | 1 | — | 1.3× over |
| Thallium Heavy metal |
0.132 ppb | 0.1 | 2.0 | — | — | — | — | 1.3× over |
| Bromodichloromethane Disinfection byproduct |
0.0748 ppb | 0.06 | — | — | — | — | — | 1.2× over |
| Dibromochloromethane Disinfection byproduct |
0.0799 ppb | 0.1 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
120.3 ppb | 210.0 | — | — | — | — | — | Below guideline |
| 4,8-dioxa-3H-perfluorononanoic acid (ADONA) PFAS |
0.435 ppt | 1.0 | — | — | — | — | — | Below guideline |
| Perchlorate Disinfection byproduct |
0.227 ppb | 1.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
16.9 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Chloroform Disinfection byproduct |
0.0637 ppb | 0.4 | — | — | — | — | — | Below guideline |
| Nitrate and nitrite Inorganic |
0.0177 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | Below guideline |
| Nitrate Inorganic |
0.0123 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | Below guideline |
| Perfluorooctane sulfonate (PFOS) PFAS |
0.01 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | Below guideline |
| Bromoform Disinfection byproduct |
0.0138 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Cobalt Other |
1.88 ppb | 70.0 | — | — | — | — | — | Below guideline |
| Uranium Radiological |
0.01 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | Below guideline |
| Barium Heavy metal |
2.89 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Molybdenum Other |
0.055 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
0.015 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
0.714 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
0.078 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Trichlorotrifluoroethane Other |
0.0575 ppb | 4000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0126 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.008 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| 1,1-Dichloroethylene Volatile organic compound |
0.036 ppb | — | 7.0 | — | — | — | — | Below guideline |
| Cyanide Inorganic |
1.34 ppb | — | 200.0 | 50 | 70 | 150 | — | Below guideline |
| Fluoride Inorganic |
0.00662 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
0.0256 ppb | — | — | — | — | — | — | Below guideline |
| Lithium Other |
11.6 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
LIBERTY UTILITIES NEW YORK - MERRICK service area
This water system serves 1 community in Nassau County, New York. Click any city for its dedicated tap water quality page.
Find the right filter for HEMPSTEAD (T) water
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