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Madison Water District

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
2,050 people
Connections
636
Water source
Groundwater
Based in
Mansfield, OH
County
Richland
Owner
Local government
The ZIP code it serves

44905

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 201 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, nitrate, arsenic, chromium (total), haloacetic acids (HAA5) and total trihalomethanes (TTHM): Ohio’s own results, samples taken from June 4, 2020 to Aug. 7, 2025, with EPA’s 2012 to 2019 file for earlier years.

Below EPA’s limits2

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.14ppm

Highest yearly average, 2022 to 2025

Averaged by year, the highest was 0.14 ppm, in 2025, below EPA’s legal limit of 4.0 ppm. That was also the latest year on file.

What handles it

Nitrate

Comes from the source

Below EPA’s limits

0.29ppm

Highest sample; found in 3 of 6

2025: not found

The highest sample, in 2021, was 0.29 ppm, below EPA’s legal limit of 10 ppm. In 2025, the latest year on file, it wasn’t found in its one sample.

What handles it

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

Violations since 2016

No health-based violations on file with EPA since 2016.

What this report can’t tell you

  • Everything else. Fluoride, nitrate, arsenic, chromium (total), haloacetic acids (HAA5) and total trihalomethanes (TTHM) results here are Ohio’s own from 2020 on, with EPA’s national file for 2012 to 2019. Madison 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; Ohio’s results run from June 4, 2020 to Aug. 7, 2025.

Testing your own tap

Madison 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 Ohio certifies.

The 3 labs Ohio certifies closest to the area Madison Water District 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 30 miles

    Certified for bacteria

    (330) 670-7920

  • Edenridge Laboratory, Ltd.

    Millersburg, OH · about 35 miles

    Certified for bacteria

    (330) 893-2933

  • Eurofins DW and WW Central - Marion

    Marion, OH · about 37 miles

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

    (740) 389-5991

All 76 certified labs for Ohio

Sources

PWSID OH7006712. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Richland County

All Ohio utilities

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