Liberty Utilities New York - Mill Neck
What EPA’s and New York’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals; lead and copper; and violations since 2016, with the certification that handles each result.
- Serves
- 280 people
- Connections
- 97
- Water source
- Groundwater
- Based in
- Oyster Bay (T), NY
- County
- Nassau
- Owner
- Private
The short answer
Nothing in EPA’s and New York’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, plus lead and copper, not everything. No health-based violations on file since 2016.
What was found
Copper: EPA’s file records a utility’s copper only when it exceeds the action level. The last here was 1.6 ppm, for the period ending Dec. 31, 2017. None since is on file, so it is not counted as a current finding.
Haloacetic acids (HAA5) and total trihalomethanes (TTHM): New York’s yearly summaries per water system, 2020 to 2024.
Nitrate, chromium (total), fluoride, arsenic and uranium: EPA’s compliance monitoring file, samples taken from Dec. 29, 2012 to Sept. 19, 2019. Newer results are in the utility’s annual water quality report.
Below EPA’s limits3
Nitrate
Comes from the source
1.5ppm
Highest sample; found in 15 of 15
2019 average: 1.5 ppm
The highest sample, in 2019, was 1.5 ppm, below EPA’s legal limit of 10 ppm. That was also the latest year on file, and its two samples averaged 1.5 ppm.
What handles it
- NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
- NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
Chromium (total)
Comes from the source
3.3ppb
Highest yearly average, 2012 to 2019
2019: not found
Averaged by year, the highest was 3.3 ppb, in 2017, below EPA’s legal limit of 100 ppb. Its highest single sample was 9.9 ppb. In 2019, the latest year on file, it wasn’t found in any of its two samples.
What handles it
- NSF/ANSI 58 look for “Chromium (Hexavalent) Reduction”
- NSF/ANSI 53 look for “Chromium Reduction”
Fluoride
Forms or is added in treatment
0.055ppm
Highest yearly average, 2012 to 2019
2019: not found
Averaged by year, the highest was 0.055 ppm, in 2016, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.11 ppm. In 2019, the latest year on file, it wasn’t found in any of its two samples.
What handles it
- NSF/ANSI 58 look for “Fluoride Reduction”
- NSF/ANSI 53 look for “Fluoride”
5 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- Arsenic
- Haloacetic acids (HAA5)
- Lead
- Total trihalomethanes (TTHM)
- Uranium
Violations since 2016
No health-based violations on file with EPA since 2016.
What this report can’t tell you
Everything else. Haloacetic acids (HAA5) and total trihalomethanes (TTHM) results here are New York’s own yearly summaries from 2020 on, with EPA’s national file for 2012 to 2019. Nitrate, chromium (total), fluoride, arsenic and uranium come from EPA’s file alone, which ends in 2019. Liberty Utilities New York - Mill Neck’s own annual report, which it must send you every year, has newer results for those and the contaminants this page does not show.
Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.
What it means for your health. This page reports what the records show and EPA’s limits and goals; it is not medical advice. If you are worried about a health effect, talk to a doctor or your local health department.
Anything after the latest data. SDWIS data is from 2026 Q3; UCMR 5 didn’t sample this utility; New York’s yearly summaries cover 2020 to 2024; EPA’s compliance samples are from Dec. 29, 2012 to Sept. 19, 2019.
Testing your own tap
The 3 labs New York certifies closest to the area Liberty Utilities New York - Mill Neck serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
NY Environmental and Analytical Labs Inc.
Port Washington, NY · about 8 miles
Certified for bacteria, lead and copper
Certified Laboratories LLC
Melville, NY · about 9 miles
Certified for bacteria
Pace Analytical Services, LLC - Melville, NY
Melville, NY · about 9 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts
Sources
- EPA UCMR 5 occurrence data, file of Oct. 15, 2026
- EPA SDWA bulk download (SDWIS federal data), 2026 Q3
- New York State Department of Health, Environmental Public Health Tracker, results from Jan. 1, 2020 to Dec. 31, 2024, read Oct. 8, 2026
- EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, file of Feb. 5, 2024
- Certified labs: NYS Environmental Laboratory Approval Program (ELAP), drinking water labs, as listed in TNI LAMS, read Oct. 11, 2026; distances from the Census 2020 ZIP code tabulation area gazetteer
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID NY2902838. Rebuilt from EPA data on Oct. 18, 2026.
What to do next
- Nothing here is above a health goalIn EPA’s and New York’s records for this utility. They don’t cover everything, which is why the next step matters.Every contaminant TapBuff tracks
- Get the utility’s own reportLiberty Utilities New York - Mill Neck must send you a water quality report every year. It covers contaminants this page does not show, and has newer results than EPA’s national file for the ones here that come from it.How to read it
- Test your own tap for leadYour service line, solder and fixtures decide the lead at your faucet, not the utility’s average.Lead in your water: what to do
- Decide if you want a filter at allA filter for taste or chlorine is a preference, not a need. The standards say what each kind can do.NSF/ANSI standards, decoded