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Woodbury Knoll, LLC.

What EPA’s and CDC’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
258 people
Connections
65
Water source
Groundwater
Based in
Woodbury, CT
County
Litchfield
Owner
Private
The ZIP code it serves

06798

The short answer

3 results are above the health goal. The worst: Lead, above the health goal. 1 health-based violation since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2005 to 2023.

Arsenic, uranium and nitrate: Connecticut’s yearly averages per water system, as CDC’s Environmental Public Health Tracking Network publishes them, 2020 to 2023, with EPA’s 2012 to 2019 file for earlier years.

Fluoride and chromium (total): EPA’s compliance monitoring file, samples taken from Jan. 6, 2014 to Jan. 23, 2017. Newer results are in the utility’s annual water quality report.

Above the health goal3

Lead

Comes from pipes, often your own

Above the health goal

8.4ppb

90th percentile, 2021 to 2023

In the latest period, 9 in 10 homes sampled were at or below 8.4 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

Arsenic

Comes from the source

Above the health goal

3.0ppb

Highest yearly average, 2020 to 2023

2023: not found

Averaged by year, the highest was 3.0 ppb, in 2020: below EPA’s legal limit of 10 ppb, but above its health goal of zero. In 2023, the latest year on file, it wasn’t found.

What handles it

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

Uranium

Comes from the source

Above the health goal

2.3ppb

Highest yearly average, 2022 to 2023

2023: not found

Averaged by year, the highest was 2.3 ppb, in 2022: below EPA’s legal limit of 30 ppb, but above its health goal of zero. In 2023, the latest year on file, it wasn’t found. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 2.3 ppb, in 2019.

What handles it

Below EPA’s limits2

Nitrate

Comes from the source

Below EPA’s limits

1.0ppm

Highest yearly average, 2020 to 2023

Averaged by year, the highest was 1.0 ppm, in 2023, below EPA’s legal limit of 10 ppm. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.9 ppm, in 2018.

What handles it

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

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.12ppm

Highest yearly average, 2014 to 2017

2017, one sample: 0.1 ppm

Averaged by year, the highest was 0.12 ppm, in 2014, below EPA’s legal limit of 4.0 ppm. In 2017, the latest year on file, its one sample was 0.1 ppm.

What handles it

One compound tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Chromium (total)

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

    For: Lead, Arsenic

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

  • NSF/ANSI 58

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

    For: Lead, Arsenic, 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 water filters for lead, ranked

The best reverse osmosis systems, ranked

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Lead and Copper Rule RevisionsThe required inventory of lead service lines was not completed or submitted on time.EPA: LSL InventoryOct. 17, 2024—Unaddressed
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 59 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Arsenic, uranium and nitrate results here are Connecticut’s yearly averages as CDC publishes them, 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. Woodbury Knoll, 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; CDC’s yearly averages for Connecticut cover 2020 to 2023; EPA’s compliance samples are from Jan. 6, 2014 to Jan. 23, 2017.

Testing your own tap

Woodbury Knoll, 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 Connecticut certifies.

The 3 labs Connecticut certifies closest to the area Woodbury Knoll, LLC. serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Northwest Environmental Water Labs

    Waterbury, CT · about 11 miles

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

    (203) 437-4110

  • ALS Environmental - Newtown

    Newtown, CT · about 13 miles

    Certified for bacteria, nitrate, metals, minerals and other inorganics, organic chemicals, radioactivity

    (203) 270-9973

  • Aquatek Labs, Inc.

    Woodbridge, CT · about 17 miles

    Certified for bacteria, nitrate, metals, minerals and other inorganics, organic chemicals, radioactivity

    (203) 389-1824

All 86 certified labs for Connecticut

Sources

PWSID CT1680051. Rebuilt from EPA data on Oct. 18, 2026.

Also in Litchfield County

All Connecticut utilities

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