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Knollwood Apartments

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
312 people
Connections
113
Water source
Groundwater
Based in
Mansfield, CT
County
Tolland
Owner
Private
The ZIP code it serves

06268

The short answer

1 result is above the health goal. The worst: Uranium, above the health goal. 2 health-based violations since 2016.

What handles it

What was found

Nitrate and arsenic: 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.

Uranium, chromium (total) and fluoride: EPA’s compliance monitoring file, samples taken from Sept. 13, 2012 to Dec. 18, 2019. Newer results are in the utility’s annual water quality report.

Above the health goal1

Uranium

Comes from the source

Above the health goal

3.6ppb

Highest yearly average, 2013 to 2019

2019, one sample: 3.1 ppb

Averaged by year, the highest was 3.6 ppb, in 2013: below EPA’s legal limit of 30 ppb, but above its health goal of zero. In 2019, the latest year on file, its one sample was 3.1 ppb.

What handles it

Below EPA’s limits1

Nitrate

Comes from the source

Below EPA’s limits

0.15ppm

Highest yearly average, 2020 to 2023

2023 average: 0.13 ppm

Averaged by year, the highest was 0.15 ppm, in 2020, below EPA’s legal limit of 10 ppm. In 2023, the latest year on file, it averaged 0.13 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.22 ppm, in 2012.

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)
  • Fluoride
  • Lead

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?

These come with the water itself, so a whole-house system certified for the same claims treats every tap and shower. A filter at the tap treats drinking water for much less. How whole-house systems compare.

Filters with those claims on a certifier’s listing

None of the filters TapBuff has checked so far carry these claims. Search the certifier listings for the claim above.

Compare five-year costs

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
Lead and Copper RuleOCCT/SOWT Treatment Installation/DemonstrationAug. 15, 2020—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 23 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Nitrate and arsenic results here are Connecticut’s yearly averages as CDC publishes them, from 2020 on, with EPA’s national file for 2012 to 2019. Uranium, chromium (total) and fluoride come from EPA’s file alone, which ends in 2019. Knollwood Apartments’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 Sept. 13, 2012 to Dec. 18, 2019.

Testing your own tap

Knollwood Apartments’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 Knollwood Apartments 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 15 miles

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

    (860) 645-1102

  • Microbac Laboratories, INC. - Dayville

    Dayville, CT · about 21 miles

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

    (860) 774-6814

  • Pace Analytical Services, LLC - East Longmeadow

    East Longmeadow, MA · about 22 miles

    Certified for bacteria, nitrate, minerals and other inorganics, organic chemicals, PFAS

    (413) 525-2332

All 86 certified labs for Connecticut

Sources

PWSID CT0780051. Rebuilt from EPA data on Oct. 18, 2026.

Also in Tolland County

All Connecticut utilities

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