What was found in Ossining'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 |
|---|---|---|---|
| Fluoride | 850.4 µg/L 21% of the EPA limit 4000 µg/L Main supplier: OSSINING WATER DEPARTMENT · 30,000 people · 2019 | 2/2 | SYR4 |
| Nitrate | 596 µg/L 6% of the EPA limit 10000 µg/L Main supplier: OSSINING WATER DEPARTMENT · 30,000 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 430 µg/L 4.3% of the EPA limit 10000 µg/L Highest in the city: SUNSHINE CHILDRENS HOME & REHAB CENTER · 130 people · 2018 | 1/2 | SYR4 |
| Barium | 39.2 µg/L 2% of the EPA limit 2000 µg/L Main supplier: OSSINING WATER DEPARTMENT · 30,000 people · 2019
Highest in the city: 333.8 µg/L — SUNSHINE CHILDRENS HOME & REHAB CENTER · 130 people · 2019 | 2/2 | SYR4 |
| TTHM | 75.62 µg/L 95% of the EPA limit 80 µg/L Main supplier: OSSINING WATER DEPARTMENT · 30,000 people · 2019 | 2/2 | SYR4 |
| Chloroform | 57.22 µg/L No EPA limit set Main supplier: OSSINING WATER DEPARTMENT · 30,000 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 51.405 µg/L 86% of the EPA limit 60 µg/L Main supplier: OSSINING WATER DEPARTMENT · 30,000 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 27.83 µg/L No EPA limit set Main supplier: OSSINING WATER DEPARTMENT · 30,000 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 26.01 µg/L No EPA limit set Main supplier: OSSINING WATER DEPARTMENT · 30,000 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 17.5 µg/L No EPA limit set Main supplier: OSSINING WATER DEPARTMENT · 30,000 people · 2019 | 2/2 | SYR4 |
| Combined Radium (-226 And -228) | 12.725 pCi/L 255% of the EPA limit, at the 95th percentile of samples — 5 pCi/L Highest in the city: SUNSHINE CHILDRENS HOME & REHAB CENTER · 130 people · 2019 | 1/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1.45 pCi/L 9.7% of the EPA limit 15 pCi/L Main supplier: OSSINING WATER DEPARTMENT · 30,000 people · 2013
Highest in the city: 10 pCi/L — SUNSHINE CHILDRENS HOME & REHAB CENTER · 130 people · 2019 | 2/2 | SYR4 |
| Chromium | 5.96 µg/L 6% of the EPA limit 100 µg/L Highest in the city: SUNSHINE CHILDRENS HOME & REHAB CENTER · 130 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 3.932 µg/L No EPA limit set Main supplier: OSSINING WATER DEPARTMENT · 30,000 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 1.774 µg/L No EPA limit set Main supplier: OSSINING WATER DEPARTMENT · 30,000 people · 2019
Highest in the city: 3.15 µg/L — SUNSHINE CHILDRENS HOME & REHAB CENTER · 130 people · 2019 | 2/2 | SYR4 |
| Combined Uranium | 0.1970 µg/L 0.7% of the EPA limit 30 µg/L Main supplier: OSSINING WATER DEPARTMENT · 30,000 people · 2013
Highest in the city: 2.86 µg/L — SUNSHINE CHILDRENS HOME & REHAB CENTER · 130 people · 2019 | 2/2 | SYR4 |
| Bromoform | 1.626 µg/L No EPA limit set Highest in the city: SUNSHINE CHILDRENS HOME & REHAB CENTER · 130 people · 2019 | 1/2 | SYR4 |
| Selenium | 1 µg/L 2% of the EPA limit 50 µg/L Highest in the city: SUNSHINE CHILDRENS HOME & REHAB CENTER · 130 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.8100 µg/L 14% of the EPA limit 6 µg/L Main supplier: OSSINING WATER DEPARTMENT · 30,000 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Adipate | 0.6000 µg/L 0.2% of the EPA limit 400 µg/L Highest in the city: SUNSHINE CHILDRENS HOME & REHAB CENTER · 130 people · 2018 | 1/2 | SYR4 |
| Arsenic | 0.4000 µg/L 4% of the EPA limit 10 µg/L Highest in the city: SUNSHINE CHILDRENS HOME & REHAB CENTER · 130 people · 2019 | 1/2 | SYR4 |
| Thallium, Total | 0.2000 µg/L 10% of the EPA limit 2 µg/L Highest in the city: SUNSHINE CHILDRENS HOME & REHAB CENTER · 130 people · 2019 | 1/2 | SYR4 |
| PFOA | 0.0043 µg/L No EPA limit set Main supplier: OSSINING WATER DEPARTMENT · 30,000 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0030 mg/L 20% of the EPA limit 0.0150 mg/L Main supplier: OSSINING WATER DEPARTMENT · 30,000 people · 2025 | 2/2 | LCR |
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 Ossining
| Supplier | Population served |
|---|---|
| OSSINING WATER DEPARTMENT | 30,000 |
| SUNSHINE CHILDRENS HOME & REHAB CENTER | 130 |
Frequently asked questions about Ossining tap water
Is Ossining tap water safe to drink?
EPA testing detected 24 contaminants in the water serving Ossining. 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 Ossining?
2 public water suppliers report drinking-water monitoring for Ossining, New York to the EPA. Each is listed above with its population served.
What contaminants are in Ossining's water?
The contaminants EPA monitoring detected in Ossining include Fluoride, Nitrate, Nitrate-Nitrite, Barium, TTHM. 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.