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Tap water quality report

Ossining Water Department

EPA monitoring tested this supplier for 104 contaminants and detected 16. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

104
contaminants tested
16
detected
30,000
people served
12
health-based violations
New York rankingsLead in New YorkPFAS in New York
Water source
Surface water
Ownership
Local government
Counties served
Westchester

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.

12
health-based violations
300
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2004-12-15
TT Health-based Resolved 2004-12-15
TT Health-based Resolved 2004-12-15
TT Health-based Resolved 2004-12-15
TT Health-based Resolved 2003-01-01 → 2003-01-31
TT Health-based Resolved 2003-01-01 → 2003-01-31
TT Health-based Resolved 2003-01-01 → 2003-01-31
TT Health-based Resolved 2003-01-01 → 2003-01-31
TT Health-based Resolved 2002-06-01 → 2002-06-30
TT Health-based Resolved 2002-06-01 → 2002-06-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFOA 0.0043 µg/L 1/4 2024

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
Bromodichloromethane
17.5 µg/L
No EPA limit set
worst single sample: 26.5 µg/L
100/100 SYR4 2013–2019
Chloroform
57.22 µg/L
No EPA limit set
worst single sample: 68.3 µg/L
100/100 SYR4 2013–2019
TTHM
75.62 µg/L 95%
of the EPA limit 80 µg/L
worst single sample: 101.6 µg/L
100/100 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
51.405 µg/L 86%
of the EPA limit 60 µg/L
worst single sample: 59.4 µg/L
100/100 SYR4 2013–2019
Trichloroacetic Acid
26.01 µg/L
No EPA limit set
worst single sample: 31 µg/L
100/100 SYR4 2013–2019
Dibromochloromethane
3.932 µg/L
No EPA limit set
worst single sample: 8.5 µg/L
99/100 SYR4 2013–2019
Dichloroacetic Acid
27.83 µg/L
No EPA limit set
worst single sample: 34.7 µg/L
99/100 SYR4 2013–2019
Lead
0.0030 mg/L 20%
of the EPA limit 0.0150 mg/L
 25/25 LCR 2025
Nitrate
596 µg/L 6%
of the EPA limit 10000 µg/L
 12/14 SYR4 2012–2019
Barium
39.2 µg/L 2%
of the EPA limit 2000 µg/L
worst single sample: 39.9 µg/L
6/7 SYR4 2012–2019
Dibromoacetic Acid
1.774 µg/L
No EPA limit set
worst single sample: 1.78 µg/L
5/100 SYR4 2013–2019
Fluoride
850.4 µg/L 21%
of the EPA limit 4000 µg/L
worst single sample: 875 µg/L
4/7 SYR4 2012–2019
Combined Uranium
0.1970 µg/L 0.7%
of the EPA limit 30 µg/L
 1/1 SYR4 2013
Di(2-ethylhexyl) Phthalate
0.8100 µg/L 14%
of the EPA limit 6 µg/L
 1/14 SYR4 2012–2019
Gross Alpha, Excl. Radon And U
1.45 pCi/L 9.7%
of the EPA limit 15 pCi/L
 1/1 SYR4 2013
88 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitrate-NitriteNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
D'ATTORE, KAREN
Phone
914-941-3554
Email
[email protected]

Frequently asked questions about Ossining Water Department

Is Ossining Water Department tap water safe to drink?

EPA monitoring detected 16 contaminants in Ossining Water Department'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 Ossining Water Department's water?

EPA monitoring detected Bromodichloromethane, Chloroform, TTHM, Total Haloacetic Acids (HAA5), Trichloroacetic Acid, and others. The full list with the level and data source for each is above.

How many people does Ossining Water Department serve?

Ossining Water Department reports serving 30,000 people in New York, per its EPA record.

Has Ossining Water Department had any water quality violations?

The EPA has 300 violations on file for Ossining Water Department, of which 12 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.