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Winchester Water Dept

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
2,800 people
Connections
1,128
Water source
Groundwater
Based in
Winchester, NH
County
Cheshire
Owner
Local government
The 2 ZIP codes it serves

03441, 03470

The short answer

Nothing in EPA’s and CDC’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

Copper: EPA’s file records a utility’s copper only when it exceeds the action level. The last here was 1.5 ppm, for the period ending Dec. 31, 1993. None since is on file, so it is not counted as a current finding.

Nitrate, arsenic, haloacetic acids (HAA5), total trihalomethanes (TTHM) and uranium: New Hampshire’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.

Below EPA’s limits1

Nitrate

Comes from the source

Below EPA’s limits

0.9ppm

Highest yearly average, 2020 to 2023

Averaged by year, the highest was 0.9 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 1.6 ppm, in 2015.

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
  • Haloacetic acids (HAA5)
  • Total trihalomethanes (TTHM)
  • Uranium

Violations since 2016

No health-based violations on file with EPA since 2016. There is 1 monitoring or reporting violation: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Nitrate, arsenic, haloacetic acids (HAA5), total trihalomethanes (TTHM) and uranium results here are New Hampshire’s yearly averages as CDC publishes them, from 2020 on, with EPA’s national file for 2012 to 2019. Winchester Water Dept’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; CDC’s yearly averages for New Hampshire cover 2020 to 2023.

Testing your own tap

Winchester Water Dept’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 Hampshire certifies.

The 3 labs New Hampshire certifies closest to the area Winchester Water Dept serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Keene City Laboratory

    Swanzey, NH · about 8 miles

    Certified for bacteria

    (603) 357-9836

  • Nelson Analytical Lab - Keene Division

    Swanzey, NH · about 14 miles

    Certified for bacteria

    (603) 357-2577

  • Pace Analytical Services, LLC - East Longmeadow, MA

    East Longmeadow, MA · about 50 miles

    Certified for nitrate, minerals and other inorganics, organic chemicals, disinfection byproducts, PFAS

    (413) 525-2332

All 63 certified labs for New Hampshire

Sources

PWSID NH2531010. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Cheshire County

All New Hampshire utilities

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