Carroll Water and Sewer
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
- 2,288 people
- Connections
- 1,436
- Water source
- Surface water
- Based in
- Oak Harbor, OH
- County
- Ottawa
- Owner
- Local government
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 665 mg/L (2004) 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.
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, 2000. None since is on file, so it is not counted as a current finding.
Total trihalomethanes (TTHM), haloacetic acids (HAA5), nitrate, fluoride, arsenic and chromium (total): Ohio’s own results, samples taken from Jan. 16, 2020 to Dec. 2, 2025, with EPA’s 2012 to 2019 file for earlier years.
Below EPA’s limits4
Total trihalomethanes (TTHM)
Forms or is added in treatment
71.6ppb
Highest yearly average, 2020 to 2025
2025 average: 34.6 ppb
Averaged by year, the highest was 71.6 ppb, in 2023, below EPA’s legal limit of 80 ppb. Its highest single sample was 114 ppb. In 2025, the latest year on file, its eight samples averaged 34.6 ppb. EPA recorded no violation for total trihalomethanes (TTHM) at this utility since 2020. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 69.4 ppb, in 2015, and EPA recorded a violation in 2015.
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
42.9ppb
Highest yearly average, 2020 to 2025
2025 average: 24.6 ppb
Averaged by year, the highest was 42.9 ppb, in 2023, below EPA’s legal limit of 60 ppb. Its highest single sample was 76.3 ppb. In 2025, the latest year on file, its eight samples averaged 24.6 ppb. EPA recorded no violation for haloacetic acids (HAA5) at this utility since 2020. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 36.2 ppb, in 2015.
What handles it
No certification claim covers this compound yet.
Nitrate
Comes from the source
4.6ppm
Highest sample; found in 54 of 72
2025 average: 0.92 ppm
The highest sample, in 2021, was 4.6 ppm, below EPA’s legal limit of 10 ppm. In 2025, the latest year on file, its 12 samples averaged 0.92 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 5.0 ppm, in 2017.
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
0.14ppm
Highest yearly average, 2020 to 2025
2025: not found
Averaged by year, the highest was 0.14 ppm, in 2021, below EPA’s legal limit of 4.0 ppm. In 2025, the latest year on file, it wasn’t found in its one sample.
What handles it
- NSF/ANSI 58 look for “Fluoride Reduction”
- NSF/ANSI 53 look for “Fluoride”
3 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- Arsenic
- Chromium (total)
- Lead
Violations since 2016
No health-based violations on file with EPA since 2016. There are 3 monitoring or reporting violations: a sample missed, late or not reported.
What this report can’t tell you
Everything else. Total trihalomethanes (TTHM), haloacetic acids (HAA5), nitrate, fluoride, arsenic and chromium (total) results here are Ohio’s own from 2020 on, with EPA’s national file for 2012 to 2019. Carroll Water and Sewer’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 Jan. 16, 2020 to Dec. 2, 2025.
Testing your own tap
The 3 labs Ohio certifies closest to the area Carroll Water and Sewer serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
The Ohio State University Stone Laboratory
Put-in-Bay, OH · about 17 miles
Jones & Henry Laboratories
Northwood, OH · about 18 miles
Certified for nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts
Erie County Health Department Laboratory
Sandusky, OH · about 22 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 OH6205111. 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 reportCarroll Water and Sewer 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