Mondovi Waterworks
What EPA’s and Wisconsin’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
- 2,667 people
- Connections
- 1,130
- Water source
- Groundwater
- Based in
- Mondovi, WI
- County
- Buffalo
- Owner
- Local government
- Hardness
- Moderately hard
The ZIP code it serves
The short answer
Nothing in EPA’s and Wisconsin’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, plus lead and copper, not everything. 2 health-based violations since 2016.
What was found
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, 1993. None since is on file, so it is not counted as a current finding.
Total trihalomethanes (TTHM), haloacetic acids (HAA5), fluoride, chromium (total), nitrate and arsenic: Wisconsin’s own results, samples taken from Jan. 13, 2020 to Sept. 8, 2026, with EPA’s 2012 to 2019 file for earlier years.
Below EPA’s limits5
Total trihalomethanes (TTHM)
Forms or is added in treatment
27.5ppb
Highest yearly average, 2020 to 2025
2025, one sample: 10.8 ppb
Averaged by year, the highest was 27.5 ppb, in 2022, below EPA’s legal limit of 80 ppb. In 2025, the latest year on file, its one sample was 10.8 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 23.5 ppb, in 2016.
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
13.7ppb
Highest yearly average, 2020 to 2025
Averaged by year, the highest was 13.7 ppb, in 2025, below EPA’s legal limit of 60 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 12.2 ppb, in 2019.
What handles it
No certification claim covers this compound yet.
Fluoride
Forms or is added in treatment
0.69ppm
Highest yearly average, 2020 to 2026
2026 average: 0.67 ppm
Averaged by year, the highest was 0.69 ppm, in 2022, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.91 ppm. In 2026, the latest year on file, its 18 samples averaged 0.67 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.54 ppm, in 2012.
What handles it
- NSF/ANSI 58 look for “Fluoride Reduction”
- NSF/ANSI 53 look for “Fluoride”
Chromium (total)
Comes from the source
4.4ppb
Highest yearly average, 2020 to 2023
Averaged by year, the highest was 4.4 ppb, in 2023, below EPA’s legal limit of 100 ppb. Its highest single sample was 13.2 ppb. That was also the latest year on file.
What handles it
- NSF/ANSI 58 look for “Chromium (Hexavalent) Reduction”
- NSF/ANSI 53 look for “Chromium Reduction”
Nitrate
Comes from the source
0.006ppm
Highest sample; found in 2 of 18
2025 average: 0.001 ppm
The highest sample, in 2024, was 0.006 ppm, below EPA’s legal limit of 10 ppm. In 2025, the latest year on file, its three samples averaged 0.001 ppm.
What handles it
- NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
- NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
2 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- Arsenic
- Lead
Hardness
Moderately hard, typically 76 mg/L (4.4 grains per gallon), across 3 sampling points, in 2017.
Hardness is calcium and magnesium. EPA sets no limit for it: it shows up as scale on fixtures and in water heaters, and as soap that won’t lather. USGS calls water above 60 mg/L moderately hard, above 120 hard and above 180 very hard.
Violations since 2016
| Contaminant or rule | Type | Period | Measured | Status |
|---|---|---|---|---|
| Stage 1 Disinfectants and Disinfection Byproducts Rule | Treatment was not run by a certified operator as required.EPA: Treatment Technique No Certif. Operator | Nov. 2, 2021 | — | Resolved |
| Groundwater Rule | A significant problem found in a state inspection was not fixed on time.EPA: Failure To Address Deficiency | Jan. 10, 2017 | — | Resolved |
| Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 2 monitoring or reporting violations not shown. | ||||
What this report can’t tell you
Everything else. Total trihalomethanes (TTHM), haloacetic acids (HAA5), fluoride, chromium (total), nitrate and arsenic results here are Wisconsin’s own from 2020 on, with EPA’s national file for 2012 to 2019. Mondovi Waterworks’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; Wisconsin’s results run from Jan. 13, 2020 to Sept. 8, 2026.
Testing your own tap
The 3 labs Wisconsin certifies closest to the area Mondovi Waterworks serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Buffalo County Department of Health and Human Services
Alma, WI · about 16 miles
Certified for bacteria
Eau Claire City-County Health Department
Eau Claire, WI · about 20 miles
Certified for bacteria, nitrate, lead and copper, metals
Dunn County Health Department
Menomonie, WI · about 23 miles
Certified for bacteria, nitrate
Wisconsin State Laboratory of Hygiene: Well water test kits ordered by phone and shipped free; you pay to mail the sample back, and the lab bills you after testing. Tests run from bacteria alone to a homeowner package covering bacteria, nitrate, fluoride, metals, hardness, volatile organic compounds and atrazine. Bacteria is $35, nitrate $35, lead $38, and the homeowner package $450, as of July 1, 2026. Public Environmental and Water Testing Prices, Wisconsin State Laboratory of Hygiene.
All 156 certified labs for WisconsinSources
- EPA UCMR 5 occurrence data, file of Oct. 15, 2026
- EPA SDWA bulk download (SDWIS federal data), 2026 Q3
- Wisconsin Department of Natural Resources, Drinking Water Program, results from Jan. 2, 2020 to Oct. 5, 2026, read Oct. 8, 2026
- EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, file of Feb. 5, 2024
- Certified labs: Wisconsin DNR and DATCP, certified and approved drinking water laboratories, read Oct. 10, 2026; distances from the Census 2020 ZIP code tabulation area gazetteer
- Hardness: Wisconsin Department of Natural Resources, Drinking Water Program, results from July 11, 2017 to July 11, 2017, read Oct. 10, 2026
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID WI6060193. Rebuilt from EPA data on Oct. 18, 2026.
What to do next
- Nothing here is above a health goalIn EPA’s and Wisconsin’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 reportMondovi Waterworks 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