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Warren Water District

What EPA’s and Massachusetts’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
2,289 people
Connections
643
Water source
Groundwater
Based in
Warren, MA
County
Worcester
Owner
Local government
The 2 ZIP codes it serves

01083, 01585

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 2009 to 2025.

Copper: EPA’s file records a utility’s copper only when it exceeds the action level. The last here was 1.4 ppm, for the period ending Dec. 31, 2003. None since is on file, so it is not counted as a current finding.

Nitrate, total trihalomethanes (TTHM) and haloacetic acids (HAA5): Massachusetts’s own results, samples taken from Nov. 14, 2023 to Aug. 19, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal1

Lead

Comes from pipes, often your own

Above the health goal

1.2ppb

90th percentile, 2023 to 2025

In the latest period, 9 in 10 homes sampled were at or below 1.2 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

Nitrate

Comes from the source

Below EPA’s limits

0.93ppm

Highest sample; found in 3 of 3

2025, one sample: 0.42 ppm

The highest sample, in 2023, was 0.93 ppm, below EPA’s legal limit of 10 ppm. In 2025, the latest year on file, its one sample was 0.42 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.73 ppm, in 2019.

What handles it

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

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

5.9ppb

Highest yearly average, 2024 to 2026

Averaged by year, the highest was 5.9 ppb, in 2026, below EPA’s legal limit of 80 ppb. Its highest single sample was 10.5 ppb. That was also the latest year on file.

What handles it

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

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

2.2ppb

Highest yearly average, 2024 to 2026

2026 average: 1.6 ppb

Averaged by year, the highest was 2.2 ppb, in 2025, below EPA’s legal limit of 60 ppb. Its highest single sample was 3.2 ppb. In 2026, the latest year on file, its two samples averaged 1.6 ppb.

What handles it

No certification claim covers this compound yet.

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. Nitrate, total trihalomethanes (TTHM) and haloacetic acids (HAA5) results here are Massachusetts’s own from 2023 on, with EPA’s national file for 2012 to 2019. Warren Water District’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; Massachusetts’s results run from Nov. 14, 2023 to Aug. 19, 2026.

Testing your own tap

Warren Water District’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 Massachusetts certifies.

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

  • Quabbin Analytical Laboratory

    Belchertown, MA · about 12 miles

    Certified for bacteria

    (413) 323-7134

  • Pace Analytical LLC-East Longmeadow

    East Longmeadow, MA · about 20 miles

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

    (413) 525-2332

  • Eurofins-Worcester

    Worcester, MA · about 21 miles

    Certified for bacteria

    (401) 461-7181

All 81 certified labs for Massachusetts

Sources

PWSID MA1311000. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Worcester County

All Massachusetts utilities

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