Aqua Ohio - Mansfield System #11
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
- 280 people
- Connections
- 115
- Water source
- Groundwater
- Based in
- Massillon, OH
- County
- Richland
- Owner
- Private
The ZIP code it serves
The short answer
Nothing in EPA’s and Ohio’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
Lead and copper: copper at 175 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.
Fluoride, total trihalomethanes (TTHM), arsenic, chromium (total), haloacetic acids (HAA5) and nitrate: Ohio’s own results, samples taken from July 20, 2020 to July 23, 2025, with EPA’s 2012 to 2019 file for earlier years.
Below EPA’s limits2
Fluoride
Forms or is added in treatment
0.97ppm
Highest yearly average, 2022 to 2025
2025 average: 0.47 ppm
Averaged by year, the highest was 0.97 ppm, in 2022, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 1.0 ppm. In 2025, the latest year on file, its two samples averaged 0.47 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 1.1 ppm, in 2013.
What handles it
- NSF/ANSI 58 look for “Fluoride Reduction”
- NSF/ANSI 53 look for “Fluoride”
Total trihalomethanes (TTHM)
Forms or is added in treatment
12.2ppb
Highest yearly average, 2020 to 2025
Averaged by year, the highest was 12.2 ppb, in 2025, below EPA’s legal limit of 80 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 10.9 ppb, in 2012.
What handles it
- NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
- NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”
5 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)
- Lead
- Nitrate
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. Fluoride, total trihalomethanes (TTHM), arsenic, chromium (total), haloacetic acids (HAA5) and nitrate results here are Ohio’s own from 2020 on, with EPA’s national file for 2012 to 2019. Aqua Ohio - Mansfield System #11’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 July 20, 2020 to July 23, 2025.
Testing your own tap
The 3 labs Ohio certifies closest to the area Aqua Ohio - Mansfield System #11 serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Eastern Lab Services, Ltd.
Medina, OH · about 33 miles
Certified for bacteria
Eurofins DW and WW Central - Marion
Marion, OH · about 34 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts
Edenridge Laboratory, Ltd.
Millersburg, OH · about 38 miles
Certified for bacteria
Sources
- EPA UCMR 5 occurrence data, file of Oct. 15, 2026
- EPA SDWA bulk download (SDWIS federal data), 2026 Q3
- Ohio Environmental Protection Agency, Division of Drinking and Ground Waters, results from Jan. 2, 2020 to Dec. 31, 2025, read Oct. 17, 2026
- EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, file of Feb. 5, 2024
- Certified labs: Ohio EPA, laboratories certified/accepted to perform analyses on public drinking water, read Oct. 10, 2026; distances from the Census 2020 ZIP code tabulation area gazetteer
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID OH7003312. Rebuilt from EPA data on Oct. 18, 2026.
What to do next
- Nothing here is above a health goalIn EPA’s and Ohio’s records for this utility. They don’t cover everything, which is why the next step matters.Every contaminant TapBuff tracks
- Get the utility’s own reportAqua Ohio - Mansfield System #11 must send you a water quality report every year. It covers contaminants this page does not show.How to read it
- Test your own tap for leadYour service line, solder and fixtures decide the lead at your faucet, not the utility’s average.Lead in your water: what to do
- Decide if you want a filter at allA filter for taste or chlorine is a preference, not a need. The standards say what each kind can do.NSF/ANSI standards, decoded