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Tap water quality report

Williston Park, NY

EPA monitoring detected 15 contaminants across the 1 water supplier serving Williston Park. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

1
water supplier
7,287
people served
15
contaminants found
New York rankings Lead in New York PFAS in New York

What was found in Williston Park'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.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
5134.5 µg/L 51%
of the EPA limit 10000 µg/L
Main supplier: WILLISTON PARK (V) · 7,287 people · 2019
1/1 SYR4
Nitrate-Nitrite
5108.5 µg/L 51%
of the EPA limit 10000 µg/L
Main supplier: WILLISTON PARK (V) · 7,287 people · 2019
1/1 SYR4
Copper
41.12 µg/L 3.2%
of the EPA limit 1300 µg/L
Main supplier: WILLISTON PARK (V) · 7,287 people · 2019
1/1 SYR4
Tetrachloroethylene
16.18 µg/L 324%
of the EPA limit, at the 95th percentile of samples — 5 µg/L
Main supplier: WILLISTON PARK (V) · 7,287 people · 2019
1/1 SYR4
Barium
5.765 µg/L 0.3%
of the EPA limit 2000 µg/L
Main supplier: WILLISTON PARK (V) · 7,287 people · 2019
1/1 SYR4
Trichloroethylene
5.107 µg/L 102%
of the EPA limit, at the 95th percentile of samples — 5 µg/L
Main supplier: WILLISTON PARK (V) · 7,287 people · 2019
1/1 SYR4
Gross Beta Particle Activity
5 pCi/L
No EPA limit set
Main supplier: WILLISTON PARK (V) · 7,287 people · 2019
1/1 SYR4
Combined Radium (-226 And -228)
1.42 pCi/L 28%
of the EPA limit 5 pCi/L
Main supplier: WILLISTON PARK (V) · 7,287 people · 2019
1/1 SYR4
Combined Uranium
0.8063 µg/L 2.7%
of the EPA limit 30 µg/L
Main supplier: WILLISTON PARK (V) · 7,287 people · 2019
1/1 SYR4
PFNA
0.0078 µg/L
No EPA limit set
Main supplier: WILLISTON PARK (V) · 7,287 people · 2023
1/1 UCMR-5
PFOA
0.0056 µg/L
No EPA limit set
Main supplier: WILLISTON PARK (V) · 7,287 people · 2023
1/1 UCMR-5
Pfpea
0.0043 µg/L
No EPA limit set
Main supplier: WILLISTON PARK (V) · 7,287 people · 2023
1/1 UCMR-5
Pfhxa
0.0036 µg/L
No EPA limit set
Main supplier: WILLISTON PARK (V) · 7,287 people · 2023
1/1 UCMR-5
Pfhpa
0.0030 µg/L
No EPA limit set
Main supplier: WILLISTON PARK (V) · 7,287 people · 2023
1/1 UCMR-5
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
Main supplier: WILLISTON PARK (V) · 7,287 people · 2025
1/1 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 Williston Park

SupplierPopulation served
WILLISTON PARK (V) 7,287

Frequently asked questions about Williston Park tap water

Is Williston Park tap water safe to drink?

EPA testing detected 15 contaminants in the water serving Williston Park. 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 Williston Park?

1 public water supplier report drinking-water monitoring for Williston Park, New York to the EPA. Each is listed above with its population served.

What contaminants are in Williston Park's water?

The contaminants EPA monitoring detected in Williston Park include Nitrate, Nitrate-Nitrite, Copper, Tetrachloroethylene, 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.