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Windsor Hill Estates

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
384 people
Connections
64
Water source
Groundwater
Based in
Thompson (T), NY
County
Sullivan
Owner
Private
The ZIP code it serves

12701

The short answer

3 results are above the health goal. The worst: Arsenic, above the health goal. No health-based violations on file since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2023.

Arsenic, uranium, nitrate, haloacetic acids (HAA5) and total trihalomethanes (TTHM): New York’s yearly summaries per water system, 2021 to 2024.

Above the health goal3

Arsenic

Comes from the source

Above the health goal

1.8ppb

Highest yearly average, 2021 to 2024

2024 average: 1.4 ppb

Averaged by year, the highest was 1.8 ppb, in 2021: below EPA’s legal limit of 10 ppb, but above its health goal of zero. In 2024, the latest year on file, it averaged 1.4 ppb.

What handles it

  • NSF/ANSI 58 look for “Arsenic (Pentavalent)<=50 ppb Reduction”
  • NSF/ANSI 53 look for “Arsenic (Pentavalent)<=50 ppb Reduction”

Lead

Comes from pipes, often your own

Above the health goal

1.3ppb

90th percentile, 2023

In the latest period, 9 in 10 homes sampled were at or below 1.3 ppb, below EPA’s action level of 15 ppb. The action level drops to 10 ppb on Nov. 1, 2027. EPA’s health goal for lead is zero.

What handles it

Uranium

Comes from the source

Above the health goal

0.78ppb

Highest yearly average, 2023

Averaged by year, the highest was 0.78 ppb, in 2023: below EPA’s legal limit of 30 ppb, but above its health goal of zero. Its highest single sample was 1.3 ppb. That is the only year on file.

What handles it

Below EPA’s limits3

Nitrate

Comes from the source

Below EPA’s limits

0.61ppm

Highest sample; found in 4 of 4

2024 average: 0.58 ppm

The highest sample, in 2023, was 0.61 ppm, below EPA’s legal limit of 10 ppm. In 2024, the latest year on file, it averaged 0.58 ppm.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

1.2ppb

Highest yearly average, 2024

Averaged by year, the highest was 1.2 ppb, in 2024, below EPA’s legal limit of 60 ppb. Its highest single sample was 1.4 ppb. That is the only year on file.

What handles it

No certification claim covers this compound yet.

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

0.92ppb

Highest yearly average, 2024

Averaged by year, the highest was 0.92 ppb, in 2024, below EPA’s legal limit of 80 ppb. Its highest single sample was 1.3 ppb. That is the only year on file.

What handles it

  • NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
  • NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”

What handles it

A certification covers specific claims, not a whole standard. Look for these claims on the certifier’s listing, not the box. Wording varies a little: NSF writes “Lead Reduction,” WQA just “Lead.”

  • NSF/ANSI 53

    Claims: Arsenic (Pentavalent)<=50 ppb Reduction, Lead Reduction

    For: Arsenic, Lead

    Other certifiers’ wording: Arsenic (III) (50 ppb influent level)

  • NSF/ANSI 58

    Claims: Arsenic (Pentavalent)<=50 ppb Reduction, Lead Reduction, Uranium

    For: Arsenic, Lead, Uranium

    Other certifiers’ wording: Arsenic (Pentavalent)<=300 ppb Reduction; Arsenic (V) (300 ppb influent level)

At the tap, or for the whole house?

Lead and copper usually come from pipes and fixtures inside or near your home. A whole-house system sits where water enters, so it cannot catch what your own plumbing adds after it. For those, the filter that counts is the one at the tap. How whole-house systems compare.

Filters with those claims on a certifier’s listing

Disclosure: TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money

Compare five-year costs

The best reverse osmosis systems, ranked

The best water filters for lead, ranked

Violations since 2016

No health-based violations on file with EPA since 2016. There are 92 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Arsenic, uranium, nitrate, haloacetic acids (HAA5) and total trihalomethanes (TTHM) results here are New York’s own yearly summaries from 2021 on, with EPA’s national file for 2012 to 2019. Windsor Hill Estates’s own annual report, which it must send you every year, has 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 2021 to 2024.

Testing your own tap

Windsor Hill Estates’s results are for the water it sends out. What your own service line, solder and fixtures add shows up only in a test of your tap, by a lab New York certifies.

The 3 labs New York certifies closest to the area Windsor Hill Estates serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • AG Environmental RSC LLC Dba Sullivan County Labs

    Ferndale, NY · about 6 miles

    Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics

    (845) 704-8151

  • Ocl Analytical Services

    Bloomingburg, NY · about 15 miles

    Certified for bacteria, nitrate, minerals and other inorganics

    (845) 733-1557

  • Aqua Check Laboratories, Inc.

    Stone Ridge, NY · about 31 miles

    Certified for bacteria

    (845) 687-0420

All 161 certified labs for New York

Sources

PWSID NY5230257. Rebuilt from EPA data on Oct. 18, 2026.

Also in Sullivan County

All New York utilities

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