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Tap water quality report

Oyster Bay Wd

EPA monitoring tested this supplier for 106 contaminants and detected 16. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

106
contaminants tested
16
detected
8,700
people served
8
health-based violations
New York rankingsLead in New YorkPFAS in New York
Water source
Ground water
Ownership
Mixed public/private
Counties served
Nassau

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

8
health-based violations
12
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2007-11-01 → 2007-11-30
MCL Health-based Resolved 2007-11-01 → 2007-11-30
MCL Health-based Resolved 2007-11-01 → 2007-11-30
MCL Health-based Resolved 2007-11-01 → 2007-11-30
MCL Health-based Resolved 2003-11-01 → 2003-11-30
MCL Health-based Resolved 2003-11-01 → 2003-11-30
MCL Health-based Resolved 2003-11-01 → 2003-11-30
MCL Health-based Resolved 2003-11-01 → 2003-11-30
MR Monitoring Resolved 2019-01-01 → 2019-12-31
MR Monitoring Resolved 2019-01-01 → 2019-12-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfba 0.0059 µg/L 1/1 2025
Pfhxa 0.0041 µg/L 1/1 2025
Pfpea 0.0049 µg/L 1/1 2025

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Tetrachloroethylene
5.655 µg/L 113%
of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 6.52 µg/L
110/264 SYR4 2012–2019
Nitrate
3480 µg/L 35%
of the EPA limit 10000 µg/L
worst single sample: 4510 µg/L
98/98 SYR4 2012–2019
Barium
9.88 µg/L 0.5%
of the EPA limit 2000 µg/L
worst single sample: 10.2 µg/L
45/50 SYR4 2012–2019
Trichloroethylene
1.5 µg/L 30%
of the EPA limit 5 µg/L
worst single sample: 1.6 µg/L
43/266 SYR4 2012–2019
Nitrate-Nitrite
3550 µg/L 36%
of the EPA limit 10000 µg/L
worst single sample: 4510 µg/L
31/31 SYR4 2012–2019
Copper
71.55 µg/L 5.5%
of the EPA limit 1300 µg/L
worst single sample: 120 µg/L
20/43 SYR4 2012–2019
Lead
0.0057 mg/L 38%
of the EPA limit 0.0150 mg/L
 10/10 LCR 2023
Combined Uranium
0.3535 µg/L 1.2%
of the EPA limit 30 µg/L
worst single sample: 0.3925 µg/L
8/9 SYR4 2013–2019
Gross Beta Particle Activity
0.9183 pCi/L
No EPA limit set
worst single sample: 0.9310 pCi/L
4/4 SYR4 2016
Fluoride
110 µg/L 2.8%
of the EPA limit 4000 µg/L
 3/51 SYR4 2012–2019
1,1-Dichloroethylene
0.5800 µg/L 8.3%
of the EPA limit 7 µg/L
 1/267 SYR4 2012–2019
Combined Radium (-226 And -228)
2.5 pCi/L 50%
of the EPA limit 5 pCi/L
 1/14 SYR4 2013–2019
Di(2-ethylhexyl) Phthalate
5.5 µg/L 92%
of the EPA limit 6 µg/L
 1/32 SYR4 2012–2018
90 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDibromochloromethaneDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTTHMThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl Chloridecis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
DUPRE, EDWARD
Phone
516-922-4848

Frequently asked questions about Oyster Bay Wd

Is Oyster Bay Wd tap water safe to drink?

EPA monitoring detected 16 contaminants in Oyster Bay Wd's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Oyster Bay Wd's water?

EPA monitoring detected Tetrachloroethylene, Nitrate, Barium, Trichloroethylene, Nitrate-Nitrite, and others. The full list with the level and data source for each is above.

How many people does Oyster Bay Wd serve?

Oyster Bay Wd reports serving 8,700 people in New York, per its EPA record.

Has Oyster Bay Wd had any water quality violations?

The EPA has 12 violations on file for Oyster Bay Wd, of which 8 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.