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Aqua Ohio - Mohawk PWS

What EPA’s and Ohio’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
2,376 people
Connections
1,006
Water source
Groundwater
Based in
Massillon, OH
County
Carroll
Owner
Private
The ZIP code it serves

44644

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 2018 to 2025. Copper at 193 mg/L (2005) is left out of this report: it is one of the results Ohio sent EPA in 2006, all at µg/L magnitudes though EPA’s file marks them mg/L.

Total trihalomethanes (TTHM), nitrate, fluoride, arsenic, chromium (total) and haloacetic acids (HAA5): Ohio’s own results, samples taken from Feb. 18, 2020 to July 18, 2025, 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

6.8ppb

90th percentile, 2025

In the latest period, 9 in 10 homes sampled were at or below 6.8 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

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

17.4ppb

Highest yearly average, 2020 to 2025

Averaged by year, the highest was 17.4 ppb, in 2025, below EPA’s legal limit of 80 ppb. Its highest single sample was 26.8 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 28 ppb, in 2014.

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

0.66ppm

Highest sample; found in 11 of 12

2025 average: 0.13 ppm

The highest sample, in 2020, was 0.66 ppm, below EPA’s legal limit of 10 ppm. In 2025, the latest year on file, its two samples averaged 0.13 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.65 ppm, in 2018.

What handles it

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

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.23ppm

Highest yearly average, 2020 to 2023

Averaged by year, the highest was 0.23 ppm, in 2023, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.24 ppm. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.24 ppm, in 2017.

What handles it

3 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)

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. There is 1 monitoring or reporting violation: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM), nitrate, fluoride, arsenic, chromium (total) and haloacetic acids (HAA5) results here are Ohio’s own from 2020 on, with EPA’s national file for 2012 to 2019. Aqua Ohio - Mohawk PWS’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; Ohio’s results run from Feb. 18, 2020 to July 18, 2025.

Testing your own tap

Aqua Ohio - Mohawk PWS’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 Ohio certifies.

The 3 labs Ohio certifies closest to the area Aqua Ohio - Mohawk PWS serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Canton City Health Department

    Canton, OH · about 13 miles

    Certified for bacteria

    (330) 489-3231

  • Canton Water Laboratory

    Canton, OH · about 13 miles

    Certified for bacteria, nitrate, minerals and other inorganics

    (330) 489-3035

  • Ream & Haager Laboratories, Inc.

    Dover, OH · about 19 miles

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

    (330) 343-3711

All 76 certified labs for Ohio

Sources

PWSID OH1000812. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Carroll County

All Ohio utilities

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