What was found in Oyster Bay's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 7510 µg/L 75% of the EPA limit 10000 µg/L Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 9239 µg/L — PLAINVIEW WD · 34,000 people · 2019 | 9/10 | SYR4 |
| Nitrate-Nitrite | 6256 µg/L 63% of the EPA limit 10000 µg/L Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 8730 µg/L — HICKSVILLE WD · 48,000 people · 2019 | 9/10 | SYR4 |
| Fluoride | 139 µg/L 3.5% of the EPA limit 4000 µg/L Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 2362 µg/L — SOUTH FARMINGDALE WD · 44,700 people · 2019 | 6/10 | SYR4 |
| Copper | 225.55 µg/L 17% of the EPA limit 1300 µg/L Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 447 µg/L — PLAINVIEW WD · 34,000 people · 2019 | 9/10 | SYR4 |
| Barium | 14.965 µg/L 0.7% of the EPA limit 2000 µg/L Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 84.1 µg/L — LOCUST VALLEY WD · 7,500 people · 2019 | 9/10 | SYR4 |
| Nitrite | 52.65 µg/L 5.3% of the EPA limit 1000 µg/L Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 72 µg/L — PLAINVIEW WD · 34,000 people · 2019 | 3/10 | SYR4 |
| cis-1,2-Dichloroethylene | 1.2 µg/L 1.7% of the EPA limit 70 µg/L Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 53.1 µg/L — BETHPAGE WD · 33,000 people · 2019 | 5/10 | SYR4 |
| Chromium | 16 µg/L 16% of the EPA limit 100 µg/L Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 32 µg/L — SOUTH FARMINGDALE WD · 44,700 people · 2019 | 3/10 | SYR4 |
| 1,1-Dichloroethylene | 13.23 µg/L 189% of the EPA limit, at the 95th percentile of samples — 7 µg/L Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 20.8 µg/L — HICKSVILLE WD · 48,000 people · 2019 | 6/10 | SYR4 |
| Trichloroethylene | 13.2 µg/L 264% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 20 µg/L — BETHPAGE WD · 33,000 people · 2019 | 7/10 | SYR4 |
| Tetrachloroethylene | 3.9 µg/L 78% of the EPA limit 5 µg/L Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 19.4 µg/L — HICKSVILLE WD · 48,000 people · 2019 | 8/10 | SYR4 |
| Lead | 7.47 µg/L 50% of the EPA limit 15 µg/L Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 16.556 µg/L — LOCUST VALLEY WD · 7,500 people · 2015 | 8/10 | SYR4 |
| 1,1,1-Trichloroethane | 6.64 µg/L 3.3% of the EPA limit 200 µg/L Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 11.44 µg/L — PLAINVIEW WD · 34,000 people · 2019 | 4/10 | SYR4 |
| Arsenic | 10.65 µg/L 107% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: JERICHO WD · 58,000 people · 2019 | 5/10 | SYR4 |
| 1,1,2-Trichloroethane | 4.353 µg/L 87% of the EPA limit 5 µg/L Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 10.34 µg/L — HICKSVILLE WD · 48,000 people · 2019 | 3/10 | SYR4 |
| TTHM | 3.98 µg/L 5% of the EPA limit 80 µg/L Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 9.14 µg/L — PLAINVIEW WD · 34,000 people · 2019 | 5/10 | SYR4 |
| Carbon Tetrachloride | 7.15 µg/L 143% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: JERICHO WD · 58,000 people · 2019 | 4/10 | SYR4 |
| Beryllium, Total | 0.3400 µg/L 8.5% of the EPA limit 4 µg/L Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 6.45 µg/L — PLAINVIEW WD · 34,000 people · 2019 | 4/10 | SYR4 |
| Selenium | 2.84 µg/L 5.7% of the EPA limit 50 µg/L Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 6.275 µg/L — HICKSVILLE WD · 48,000 people · 2019 | 2/10 | SYR4 |
| Combined Uranium | 0.7170 µg/L 2.4% of the EPA limit 30 µg/L Main supplier: JERICHO WD · 58,000 people · 2016
Highest in the city: 5.9555 µg/L — BETHPAGE WD · 33,000 people · 2018 | 8/10 | SYR4 |
| Combined Radium (-226 And -228) | 1.83 pCi/L 37% of the EPA limit 5 pCi/L Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 5.824 pCi/L — BETHPAGE WD · 33,000 people · 2019 | 7/10 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 5.5 µg/L 92% of the EPA limit 6 µg/L Highest in the city: OYSTER BAY WD · 8,700 people · 2018 | 2/10 | SYR4 |
| Gross Alpha, Excl. Radon And U | 4.8025 pCi/L 32% of the EPA limit 15 pCi/L Highest in the city: BETHPAGE WD · 33,000 people · 2018 | 5/10 | SYR4 |
| trans-1,2-Dichloroethylene | 4.6865 µg/L 4.7% of the EPA limit 100 µg/L Highest in the city: BETHPAGE WD · 33,000 people · 2019 | 2/10 | SYR4 |
| Gross Beta Particle Activity | 1.372 pCi/L No EPA limit set Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 3.8185 pCi/L — BETHPAGE WD · 33,000 people · 2019 | 9/10 | SYR4 |
| 1,2-Dichloropropane | 3.5 µg/L 70% of the EPA limit 5 µg/L Main supplier: JERICHO WD · 58,000 people · 2019 | 4/10 | SYR4 |
| Bromoform | 2.5 µg/L No EPA limit set Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 3.405 µg/L — PLAINVIEW WD · 34,000 people · 2019 | 4/10 | SYR4 |
| 1,2-Dichloroethane | 1.3 µg/L 26% of the EPA limit 5 µg/L Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 3.2 µg/L — HICKSVILLE WD · 48,000 people · 2019 | 5/10 | SYR4 |
| Dibromochloromethane | 1.214 µg/L No EPA limit set Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 2.96 µg/L — PLAINVIEW WD · 34,000 people · 2019 | 6/10 | SYR4 |
| Dibromoacetic Acid | 2.56 µg/L No EPA limit set Highest in the city: PLAINVIEW WD · 34,000 people · 2019 | 3/10 | SYR4 |
| Simazine | 2.174 µg/L 54% of the EPA limit 4 µg/L Main supplier: JERICHO WD · 58,000 people · 2019 | 1/10 | SYR4 |
| Cadmium | 1.96 µg/L 39% of the EPA limit 5 µg/L Highest in the city: MASSAPEQUA WD · 43,000 people · 2019 | 1/10 | SYR4 |
| Vinyl Chloride | 1.925 µg/L 96% of the EPA limit 2 µg/L Highest in the city: HICKSVILLE WD · 48,000 people · 2019 | 1/10 | SYR4 |
| Antimony, Total | 1.731 µg/L 29% of the EPA limit 6 µg/L Main supplier: JERICHO WD · 58,000 people · 2019 | 3/10 | SYR4 |
| Bromodichloromethane | 0.5800 µg/L No EPA limit set Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 1.4825 µg/L — SOUTH FARMINGDALE WD · 44,700 people · 2019 | 4/10 | SYR4 |
| Thallium, Total | 0.7710 µg/L 39% of the EPA limit 2 µg/L Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 1.3 µg/L — MASSAPEQUA WD · 43,000 people · 2019 | 5/10 | SYR4 |
| Toluene | 1.09 µg/L 0.1% of the EPA limit 1000 µg/L Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 1.275 µg/L — PLAINVIEW WD · 34,000 people · 2019 | 2/10 | SYR4 |
| Chloroform | 0.7810 µg/L No EPA limit set Main supplier: JERICHO WD · 58,000 people · 2019
Highest in the city: 0.9760 µg/L — SOUTH FARMINGDALE WD · 44,700 people · 2019 | 5/10 | SYR4 |
| Total Haloacetic Acids (HAA5) | 0.9600 µg/L 1.6% of the EPA limit 60 µg/L Highest in the city: MASSAPEQUA WD · 43,000 people · 2018 | 1/10 | SYR4 |
| Ethylbenzene | 0.6000 µg/L 0.1% of the EPA limit 700 µg/L Main supplier: JERICHO WD · 58,000 people · 2019 | 1/10 | SYR4 |
| Benzene | 0.5875 µg/L 12% of the EPA limit 5 µg/L Highest in the city: HICKSVILLE WD · 48,000 people · 2019 | 1/10 | SYR4 |
| Atrazine | 0.5808 µg/L 19% of the EPA limit 3 µg/L Main supplier: JERICHO WD · 58,000 people · 2019 | 1/10 | SYR4 |
| Mercury | 0.3205 µg/L 16% of the EPA limit 2 µg/L Highest in the city: PLAINVIEW WD · 34,000 people · 2019 | 2/10 | SYR4 |
| Monobromoacetic Acid | 0.3100 µg/L No EPA limit set Highest in the city: MASSAPEQUA WD · 43,000 people · 2018 | 1/10 | SYR4 |
| Dichloroacetic Acid | 0.2900 µg/L No EPA limit set Highest in the city: MASSAPEQUA WD · 43,000 people · 2018 | 1/10 | SYR4 |
| Pfba | 0.0670 µg/L No EPA limit set Main supplier: JERICHO WD · 58,000 people · 2025 | 4/10 | UCMR-5 |
| Pentachlorophenol | 0.0563 µg/L 5.6% of the EPA limit 1 µg/L Main supplier: JERICHO WD · 58,000 people · 2019 | 1/10 | SYR4 |
| Pfpea | 0.0370 µg/L No EPA limit set Main supplier: JERICHO WD · 58,000 people · 2025 | 4/10 | UCMR-5 |
| PFNA | 0.0296 µg/L No EPA limit set Highest in the city: LOCUST VALLEY WD · 7,500 people · 2024 | 1/10 | UCMR-5 |
| Heptachlor Epoxide | 0.0220 µg/L 11% of the EPA limit 0.2000 µg/L Highest in the city: HICKSVILLE WD · 48,000 people · 2019 | 1/10 | SYR4 |
| Ethylene Dibromide | 0.0200 µg/L 40% of the EPA limit 0.0500 µg/L Highest in the city: HICKSVILLE WD · 48,000 people · 2019 | 2/10 | SYR4 |
| Pfhxa | 0.0180 µg/L No EPA limit set Main supplier: JERICHO WD · 58,000 people · 2025 | 3/10 | UCMR-5 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.0100 µg/L 5% of the EPA limit 0.2000 µg/L Highest in the city: HICKSVILLE WD · 48,000 people · 2019 | 1/10 | SYR4 |
| 6:2 Fts | 0.0099 µg/L No EPA limit set Main supplier: JERICHO WD · 58,000 people · 2025 | 1/10 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: JERICHO WD · 58,000 people · 2025
Highest in the city: 0.0057 mg/L — OYSTER BAY WD · 8,700 people · 2023 | 10/10 | LCR |
| Pfhpa | 0.0046 µg/L No EPA limit set Main supplier: JERICHO WD · 58,000 people · 2025 | 1/10 | UCMR-5 |
| PFHXS | 0.0045 µg/L No EPA limit set Highest in the city: LOCUST VALLEY WD · 7,500 people · 2024 | 1/10 | UCMR-5 |
| PFBS | 0.0035 µg/L No EPA limit set Highest in the city: BETHPAGE WD · 33,000 people · 2023 | 1/10 | UCMR-5 |
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 the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Oyster Bay
| Supplier | Population served |
|---|---|
| JERICHO WD | 58,000 |
| HICKSVILLE WD | 48,000 |
| SOUTH FARMINGDALE WD | 44,700 |
| MASSAPEQUA WD | 43,000 |
| PLAINVIEW WD | 34,000 |
| BETHPAGE WD | 33,000 |
| OYSTER BAY WD | 8,700 |
| LOCUST VALLEY WD | 7,500 |
| GLENWOOD WD | 1,000 |
| LIBERTY UTILITIES NEW YORK - MILL NECK | 280 |
Frequently asked questions about Oyster Bay tap water
Is Oyster Bay tap water safe to drink?
EPA testing detected 58 contaminants in the water serving Oyster Bay. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Oyster Bay?
10 public water suppliers report drinking-water monitoring for Oyster Bay, New York to the EPA. Each is listed above with its population served.
What contaminants are in Oyster Bay's water?
The contaminants EPA monitoring detected in Oyster Bay include Nitrate, Nitrate-Nitrite, Fluoride, Copper, Barium. The full list, with the level at the main supplier and the data source, is in the table above.
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.