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Tap water quality report

Williston Park

EPA monitoring tested this supplier for 101 contaminants and detected 15. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

101
contaminants tested
15
detected
7,287
people served
6
health-based violations
New York rankingsLead in New YorkPFAS in New York
Water source
Ground water
Ownership
Local government
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.

6
health-based violations
14
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2007-01-01
TT Health-based Resolved 2007-01-01
TT Health-based Resolved 2007-01-01
TT Health-based Resolved 2007-01-01
MCL Health-based Resolved 2001-11-01 → 2001-11-30
MCL Health-based Resolved 2001-11-01 → 2001-11-30
MR Monitoring Resolved 2013-10-01 → 2013-12-31
MR Monitoring Resolved 2013-10-01 → 2013-12-31
MR Monitoring Resolved 2013-10-01 → 2013-12-31
MR Monitoring Resolved 2013-10-01 → 2013-12-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfhxa 0.0036 µg/L 2/4 2023
PFNA 0.0078 µg/L 2/4 2023
PFOA 0.0056 µg/L 2/4 2023
Pfpea 0.0043 µg/L 2/4 2023
Pfhpa 0.0030 µg/L 1/4 2023

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
Nitrate
5134.5 µg/L 51%
of the EPA limit 10000 µg/L
worst single sample: 6700 µg/L
120/120 SYR4 2012–2019
Nitrate-Nitrite
5108.5 µg/L 51%
of the EPA limit 10000 µg/L
worst single sample: 6700 µg/L
44/44 SYR4 2012–2019
Tetrachloroethylene
16.18 µg/L 324%
of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 19 µg/L
32/219 SYR4 2012–2019
Barium
5.765 µg/L 0.3%
of the EPA limit 2000 µg/L
worst single sample: 5.8 µg/L
28/28 SYR4 2012–2019
Trichloroethylene
5.107 µg/L 102%
of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 5.4 µg/L
27/215 SYR4 2012–2019
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
 14/14 LCR 2025
Copper
41.12 µg/L 3.2%
of the EPA limit 1300 µg/L
worst single sample: 67.4 µg/L
10/28 SYR4 2012–2019
Combined Uranium
0.8063 µg/L 2.7%
of the EPA limit 30 µg/L
worst single sample: 0.9300 µg/L
6/6 SYR4 2016–2019
Gross Beta Particle Activity
5 pCi/L
No EPA limit set
worst single sample: 5.86 pCi/L
6/6 SYR4 2016–2019
Combined Radium (-226 And -228)
1.42 pCi/L 28%
of the EPA limit 5 pCi/L
 1/6 SYR4 2016–2019
86 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-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, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneFluorideGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpsPFHXSPfmbaPfmpaPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl Chloridecis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
LOVISI, FRANCIS
Phone
516-746-7109
Email
[email protected]

Frequently asked questions about Williston Park

Is Williston Park tap water safe to drink?

EPA monitoring detected 15 contaminants in Williston Park'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 Williston Park's water?

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

How many people does Williston Park serve?

Williston Park reports serving 7,287 people in New York, per its EPA record.

Has Williston Park had any water quality violations?

The EPA has 14 violations on file for Williston Park, of which 6 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.