Skip to content
TapBuff
ZIP

Ctwc - Northern Reg - Llynwood System

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
192 people
Connections
73
Water source
Groundwater
Based in
Bolton, CT
County
Tolland
Owner
Private
The 2 ZIP codes it serves

06043, 06066

The short answer

1 result is above the health goal. The worst: Lead, 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 2003 to 2024.

Total trihalomethanes (TTHM), nitrate, haloacetic acids (HAA5) and uranium: 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, arsenic and chromium (total): EPA’s compliance monitoring file, samples taken from Jan. 5, 2012 to April 30, 2019. Newer results are in the utility’s annual water quality report.

Above the health goal1

Lead

Comes from pipes, often your own

Above the health goal

5.7ppb

90th percentile, 2022 to 2024

In the latest period, 9 in 10 homes sampled were at or below 5.7 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

Below EPA’s limits3

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.45ppm

Highest yearly average, 2012 to 2019

Averaged by year, the highest was 0.45 ppm, in 2019, below EPA’s legal limit of 4.0 ppm. That was also the latest year on file.

What handles it

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

2.5ppb

Highest yearly average, 2020 to 2023

2023 average: 2.5 ppb

Averaged by year, the highest was 2.5 ppb, in 2021, below EPA’s legal limit of 80 ppb. In 2023, the latest year on file, it averaged 2.5 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 4.0 ppb, in 2019.

What handles it

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

Nitrate

Comes from the source

Below EPA’s limits

0.04ppm

Highest yearly average, 2020 to 2023

2023 average: 0.02 ppm

Averaged by year, the highest was 0.04 ppm, in 2021, below EPA’s legal limit of 10 ppm. In 2023, the latest year on file, it averaged 0.02 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.02 ppm, in 2018.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
4 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)
  • Uranium

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.”

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

Violations since 2016

No health-based violations on file with EPA since 2016.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM), nitrate, haloacetic acids (HAA5) and uranium results here are Connecticut’s yearly averages as CDC publishes them, from 2020 on, with EPA’s national file for 2012 to 2019. Fluoride, arsenic and chromium (total) come from EPA’s file alone, which ends in 2019. Ctwc - Northern Reg - Llynwood System’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. 5, 2012 to April 30, 2019.

Testing your own tap

Ctwc - Northern Reg - Llynwood System’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 Ctwc - Northern Reg - Llynwood System serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Phoenix Environmental Laboratories, Inc.

    Manchester, CT · about 5 miles

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

    (860) 645-1102

  • Envirotech Laboratory

    Windsor, CT · about 13 miles

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

    (860) 688-7249

  • Northeast Laboratories, Inc

    Rocky Hill, CT · about 15 miles

    Certified for bacteria

    (860) 828-9787 ext. 108

All 86 certified labs for Connecticut

Sources

PWSID CT0120021. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Tolland County

All Connecticut utilities

What to do next