Tap Water Quality Report
Tap water quality in CLARKSTOWN (T), New York
Tap water in CLARKSTOWN (T), New York receives a grade of F (47/100) from TapWaterSafety.org. It's served by VEOLIA WATER NEW YORK. The most significant water quality concerns are: PFAS contamination; Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline; Arsenic significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in CLARKSTOWN (T)'s tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving CLARKSTOWN (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 0.631 ppt, 631x above the EWG health guideline of 0.001 ppt.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 36.8 ppb, 613x above the EWG health guideline of 0.06 ppb.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 1.54 ppb, 385x above the EWG health guideline of 0.004 ppb.
Recommended filters for CLARKSTOWN (T)
Filters matched to the specific contaminants in CLARKSTOWN (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.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Reverse Osmosis
$249-$750Arsenic is most effectively removed by reverse osmosis. Some specialized adsorptive filters also work.
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 CLARKSTOWN (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 |
|---|---|---|---|---|---|---|---|---|
| Perfluorooctanoic acid (PFOA) PFAS |
5.82 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | EPA violation |
| Perfluorohexane sulfonate (PFHXS) PFAS |
0.631 ppt | 0.001 | 10.0 | — | — | — | — | 631× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
36.8 ppb | 0.06 | — | — | — | — | — | 613× over |
| Arsenic Heavy metal |
1.54 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 385× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
57.1 ppb | 0.15 | 80.0 | 100 | — | — | — | 381× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
27.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 272× over |
| Bromodichloromethane Disinfection byproduct |
15.0 ppb | 0.06 | — | — | — | — | — | 250× over |
| Trichloroacetic acid Disinfection byproduct |
13.9 ppb | 0.1 | — | — | — | — | — | 139× over |
| Perfluorononanoic acid (PFNA) PFAS |
0.77 ppt | 0.006 | 10.0 | — | — | — | — | 128× over |
| Chloroform Disinfection byproduct |
37.4 ppb | 0.4 | — | — | — | — | — | 93× over |
| Dichloroacetic acid Disinfection byproduct |
11.9 ppb | 0.2 | — | — | — | — | — | 59× over |
| Dibromochloromethane Disinfection byproduct |
4.41 ppb | 0.1 | — | — | — | — | — | 44× over |
| Dibromoacetic acid Disinfection byproduct |
0.976 ppb | 0.03 | — | — | — | — | — | 33× over |
| Chromium (hexavalent) Heavy metal |
0.328 ppb | 0.02 | — | — | — | — | — | 16× over |
| Nitrate Inorganic |
1.74 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 12× over |
| Nitrate and nitrite Inorganic |
1.75 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 12× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
3.0 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | 10× over |
| Tetrachloroethylene (perchloroethylene) Volatile organic compound |
0.321 ppb | 0.06 | 5.0 | — | — | — | — | 5.4× over |
| Perfluorodecanoic acid (PFDA) PFAS |
0.011 ppt | 0.006 | — | — | — | — | — | 1.8× over |
| Chlorate Disinfection byproduct |
158.3 ppb | 210.0 | — | — | — | — | — | Below guideline |
| 6:2 Fluorotelomer Sulfonic Acid (6:2 FTSA) Other |
0.433 ppt | 1.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
224.9 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| 6:2 Fluorotelomer sulfonate (6 2FTS) Other |
0.302 ppt | 1.0 | — | — | — | — | — | Below guideline |
| Bromoform Disinfection byproduct |
0.151 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Chlordane Other |
0.00851 ppb | 0.03 | 2.0 | — | — | — | — | Below guideline |
| Cadmium Heavy metal |
0.0103 ppb | 0.04 | 5.0 | 5 | 3 | 0.04 | — | Below guideline |
| Manganese Heavy metal |
20.2 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Radium, combined (-226 and -228) Radiological |
0.01 pCi/L | 0.05 | 5.0 | — | — | — | — | Below guideline |
| Thallium Heavy metal |
0.0137 ppb | 0.1 | 2.0 | — | — | — | — | Below guideline |
| Antimony Heavy metal |
0.135 ppb | 1.0 | 6.0 | 10 | 20 | 1 | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.0369 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Trichloroethylene Volatile organic compound |
0.0393 ppb | 0.4 | 5.0 | 10 | 20 | 1.7 | — | Below guideline |
| Vanadium Other |
0.793 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Beryllium Heavy metal |
0.0299 ppb | 1.0 | 4.0 | — | — | 1 | — | Below guideline |
| Heptachlor epoxide Other |
0.000115 ppb | 0.006 | 0.2 | — | — | — | — | Below guideline |
| Perfluoropentane sulfonic acid (PFPeS) PFAS |
0.013 ppt | 1.0 | — | — | — | — | — | Below guideline |
| Selenium Heavy metal |
0.211 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Mercury (inorganic) Heavy metal |
0.00586 ppb | 1.2 | 2.0 | 1 | 6 | 1.2 | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.248 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.109 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
3.05 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
2.52 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
2.44 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
1.27 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
0.05 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
1.47 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| MTBE Volatile organic compound |
0.00151 ppb | 13.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.159 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Carbon tetrachloride Volatile organic compound |
9e-06 ppb | 0.1 | 5.0 | — | — | — | — | Below guideline |
| 1,1-Dichloroethane Volatile organic compound |
0.000168 ppb | 3.0 | — | — | — | — | — | Below guideline |
| 2,4-D Pesticide/Herbicide |
2.2e-05 ppb | 20.0 | 70.0 | — | — | — | — | Below guideline |
| Picloram Other |
3.4e-05 ppb | 166.0 | 500.0 | — | — | — | — | Below guideline |
| Toluene Volatile organic compound |
6e-06 ppb | 150.0 | 1000.0 | — | — | — | — | Below guideline |
| 1-Butanol Other |
0.219 ppb | — | — | — | — | — | — | Below guideline |
| Acetone Other |
18.2 ppb | — | — | — | — | — | — | Below guideline |
| Chlorodifluoromethane Other |
0.00416 ppb | — | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
1.14 ppb | — | 100.0 | — | — | — | — | Below guideline |
| cis-1,2-Dichloroethylene Volatile organic compound |
0.0512 ppb | — | 70.0 | — | — | — | — | Below guideline |
| Cyanide Inorganic |
0.203 ppb | — | 200.0 | 50 | 70 | 150 | — | Below guideline |
| Dieldrin Other |
0.000493 ppb | — | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.000227 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Lithium Other |
4.04 ppb | — | — | — | — | — | — | Below guideline |
| Nitrite Inorganic |
0.00587 ppm | — | 1.0 | — | — | — | — | Below guideline |
| Permethrin Other |
0.000727 ppb | — | — | — | — | — | — | Below guideline |
| Silver Other |
0.357 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
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