Water Quality Report · Updated May 12, 2026
JERICHO WD
JERICHO WD delivers tap water graded C (68/100) by TapWaterSafety.org. The utility serves approximately 58,000 residents in OYSTER BAY (T), New York using groundwater. The most significant water quality concerns are: PFAS contamination; Nitrate significantly above health guideline; Nitrate and nitrite significantly above health guideline; Chromium (hexavalent) significantly above health guideline. For questions, the utility can be reached at 516-921-8280.
Is OYSTER BAY (T) tap water safe to drink?
JERICHO WD delivers tap water that earns a grade of C (68/100) from TapWaterSafety.org — an average rating, with several contaminants above health guidelines but generally compliant with US legal limits.
The utility serves 58,000 residents in OYSTER BAY (T), drawing from groundwater.
Public testing data identifies 9 contaminants in this water above EWG's health-based guidelines, including: Nitrate, Nitrate and nitrite, Chromium (hexavalent), 1,2,3-Trichloropropane, Perfluorohexane sulfonate (PFHXS), Radium, combined (-226 and -228), Haloacetic acids (HAA9), Perfluorooctanoic acid (PFOA), Total trihalomethanes (TTHMs). 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 OYSTER BAY (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 JERICHO WD.
PFAS contamination
Severe concernPerfluorooctanoic acid (PFOA), Perfluorooctane sulfonate (PFOS) detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Nitrate significantly above health guideline
Moderate concernNitrate detected at 3.32 ppm, 24x above the EWG health guideline of 0.14 ppm.
Nitrate and nitrite significantly above health guideline
Moderate concernNitrate and nitrite detected at 3.32 ppm, 24x above the EWG health guideline of 0.14 ppm.
Chromium (hexavalent) significantly above health guideline
Moderate concernChromium (hexavalent) detected at 0.432 ppb, 22x above the EWG health guideline of 0.02 ppb.
Contact JERICHO WD
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 OYSTER BAY (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 68/100 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 |
|---|---|---|---|---|---|---|---|---|
| Nitrate Inorganic |
3.32 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 24× over |
| Nitrate and nitrite Inorganic |
3.32 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 24× over |
| Chromium (hexavalent) Heavy metal |
0.432 ppb | 0.02 | — | — | — | — | — | 22× over |
| 1,2,3-Trichloropropane Other |
0.00747 ppb | 0.0007 | — | — | — | — | — | 11× over |
| Perfluorohexane sulfonate (PFHXS) PFAS |
0.006 ppt | 0.001 | 10.0 | — | — | — | — | 6.0× over |
| Radium, combined (-226 and -228) Radiological |
0.17 pCi/L | 0.05 | 5.0 | — | — | — | — | 3.3× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
0.165 ppb | 0.06 | — | — | — | — | — | 2.8× over |
| Perfluorooctanoic acid (PFOA) PFAS |
0.254 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 2.8× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
0.238 ppb | 0.15 | 80.0 | 100 | — | — | — | 1.6× over |
| 1,4-Dioxane Semi-volatile organic compound |
0.292 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Bromodichloromethane Disinfection byproduct |
0.0486 ppb | 0.06 | — | — | — | — | — | Below guideline |
| Dibromochloromethane Disinfection byproduct |
0.0594 ppb | 0.1 | — | — | — | — | — | Below guideline |
| 6:2 Fluorotelomer Sulfonic Acid (6:2 FTSA) Other |
0.396 ppt | 1.0 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
78.1 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Trichloroethylene Volatile organic compound |
0.127 ppb | 0.4 | 5.0 | 10 | 20 | 1.7 | — | Below guideline |
| Chloroform Disinfection byproduct |
0.102 ppb | 0.4 | — | — | — | — | — | Below guideline |
| 1,2-Dichloropropane Volatile organic compound |
0.127 ppb | 0.5 | 5.0 | — | — | — | — | Below guideline |
| Tetrachloroethylene (perchloroethylene) Volatile organic compound |
0.00873 ppb | 0.06 | 5.0 | — | — | — | — | Below guideline |
| 6:2 Fluorotelomer sulfonate (6 2FTS) Other |
0.11 ppt | 1.0 | — | — | — | — | — | Below guideline |
| Bromoform Disinfection byproduct |
0.0297 ppb | 0.5 | — | — | — | — | — | Below guideline |
| 1,1-Dichloroethane Volatile organic compound |
0.124 ppb | 3.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
2.92 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Barium Heavy metal |
8.78 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Perfluorooctane sulfonate (PFOS) PFAS |
0.003 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | Below guideline |
| Cobalt Other |
0.68 ppb | 70.0 | — | — | — | — | — | Below guideline |
| Perfluoropentane sulfonic acid (PFPeS) PFAS |
0.006 ppt | 1.0 | — | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
4.13 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
2.43 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
1.56 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Chloromethane Other |
0.00162 ppb | 2.69 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
0.41 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
0.0076 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0377 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.005 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| 1,1-Dichloroethylene Volatile organic compound |
0.00356 ppb | — | 7.0 | — | — | — | — | Below guideline |
| Chlorodifluoromethane Other |
0.191 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.
JERICHO WD 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 OYSTER BAY (T) water
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