Stone Bridge Estates LLC

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: 120 people
Connections: 40
Water source: Groundwater
Based in: Greenport (T), NY
County: Columbia
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

Nitrate, arsenic, haloacetic acids (HAA5) and total trihalomethanes (TTHM): New York’s yearly summaries per water system, 2020 to 2024, with EPA’s 2012 to 2019 file for earlier years.

Fluoride and chromium (total): EPA’s compliance monitoring file, samples taken from Aug. 21, 2012 to July 10, 2018. Newer results are in the utility’s annual water quality report.

Below EPA’s limits2

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.2ppm

Highest yearly average, 2012 to 2018

Averaged by year, the highest was 0.2 ppm, in 2018, below EPA’s legal limit of 4.0 ppm. That was also the latest year on file.

What handles it

NSF/ANSI 58 look for “Fluoride Reduction”
NSF/ANSI 53 look for “Fluoride”

Nitrate

Comes from the source

Below EPA’s limits

0.05ppm

Highest sample; found in 4 of 6

2024 average: 0.05 ppm

The highest sample, in 2024, was 0.05 ppm, below EPA’s legal limit of 10 ppm. That was also the latest year on file, and it averaged 0.05 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.16 ppm, in 2018.

What handles it

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

5 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.

Arsenic
Chromium (total)
Haloacetic acids (HAA5)
Lead
Total trihalomethanes (TTHM)

Violations since 2016

No health-based violations on file with EPA since 2016. There are 57 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

Everything else. Nitrate, arsenic, 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. Fluoride and chromium (total) come from EPA’s file alone, which ends in 2019. Stone Bridge Estates LLC’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 Aug. 21, 2012 to July 10, 2018.

Testing your own tap

Stone Bridge Estates LLC’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.

No lab New York certifies is within 75 miles of the area Stone Bridge Estates LLC serves on the state’s list. Some take samples by mail; the state’s page lists them all.

All 161 certified labs for New York