Skip to content
TapBuff
ZIP

Wediko School

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
280 people
Connections
20
Water source
Groundwater
Based in
Windsor, NH
County
Hillsborough
Owner
Private
The ZIP code it serves

03244

The short answer

1 result is above EPA’s legal limit. The worst: Lead, above the action level. 5 health-based violations since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2021 to 2024.

Nitrate and arsenic: 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.

Above the legal limit1

Lead

Comes from pipes, often your own

Above the action level

46ppb

90th percentile, 2024

In the latest period, 9 in 10 homes sampled were at or below 46 ppb, above EPA’s action level of 15 ppb. The action level drops to 10 ppb on Nov. 1, 2027, and this result is at or above that. EPA’s health goal for lead is zero.

What handles it

Below EPA’s limits1

Nitrate

Comes from the source

Below EPA’s limits

0.92ppm

Highest yearly average, 2020 to 2023

2023 average: 0.69 ppm

Averaged by year, the highest was 0.92 ppm, in 2020, below EPA’s legal limit of 10 ppm. In 2023, the latest year on file, it averaged 0.69 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 1.9 ppm, in 2014.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
One compound tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic

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

Contaminant or ruleTypePeriodMeasuredStatus
Revised Total Coliform RuleColiform or E. coli results required a detailed review of the system, and it or its fixes were not done on time.EPA: Treatment Technique, Level 2 Assessment (RTCR)June 16, 2025—Resolved
Lead and Copper RuleOCCT/SOWT Treatment Installation/DemonstrationDec. 29, 2023—Unaddressed
Lead and Copper RuleOCCT/SOWT Treatment Installation/DemonstrationJuly 4, 2023—Resolved
Lead and Copper RuleRequired information about lead was not given to customers.EPA: Public EducationAug. 22, 2022—Resolved
Lead and Copper RuleOCCT/SOWT Treatment Installation/DemonstrationJuly 18, 2019—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 6 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Nitrate and arsenic results here are New Hampshire’s yearly averages as CDC publishes them, from 2020 on, with EPA’s national file for 2012 to 2019. Wediko School’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

Wediko School’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 Wediko School serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • New Hampshire DHHS Public Health Laboratories

    Concord, NH · about 18 miles

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

    (603) 271-3445

  • Eurofins Concord

    Concord, NH · about 20 miles

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

    (603) 228-0525

  • Nelson Analytical Lab - Keene Division

    Swanzey, NH · about 22 miles

    Certified for bacteria

    (603) 357-2577

All 63 certified labs for New Hampshire

Sources

PWSID NH2552010. Rebuilt from EPA data on Oct. 18, 2026.

Also in Hillsborough County

All New Hampshire utilities

What to do next