Tap Water Results

Is Fond du Lac, WI tap water safe?

Data: U.S. EPA · How we read the data · How we check it

Summary

No federal limits exceeded in EPA data for Fond du Lac Waterworks.

6 public water systems serve parts of Fond du Lac. The largest, Fond du Lac Waterworks, serves 44,678 people. Your water bill names your system.

Largest system

Fond du Lac Waterworks

44,678 people · Groundwater · EPA ID WI4200469

PFASHighest averageLimitStatus
PFOA
Not detected
–4 pptNot detected
PFOS
Not detected
–4 pptNot detected
PFHxS
Not detected
–10 pptNot detected
PFNA
Not detected
–10 pptNot detected
HFPO-DA (GenX)
Not detected
–10 pptNot detected

ppt = parts per trillion. "Highest average" is the highest average at any of the system's entry points, the way EPA compares results with the limits.

Lead: 6.1 ppb at the 90th percentile (Dec 2025, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 1

Across Wisconsin, 18 of 196 water systems EPA tested had PFAS above a 2024 federal limit, and 4 systems were above the lead action level in results from the last five years. Wisconsin results.

Fond du Lac homes and lead pipes

66%
of homes built before 1980 (Wisconsin 57%, US 50%)
33%
built before 1950 (Wisconsin 23%)
42%
of households rent (Wisconsin 32%)

Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. Renting? Ask your landlord what the service line is made of, because it's their pipe to replace. How to check your own line.

Housing: Census American Community Survey 2020–2024 5-year estimates for Fond du Lac city (tables B25034, B25003). Estimates for small places have a margin of error.

Other water systems serving Fond du Lac

  • Ashwood Grove Edgewater
    1,046 people · Groundwater · Wisconsin · lists this city
    Not in EPA's PFAS sample
  • Fond du Lac Tn Water Utility
    980 people · Purchased groundwater · Wisconsin · lists this city
    Not in EPA's PFAS sampleAlso: 1 health-based violation since 2016
  • Woodland Park Water System
    66 people · Groundwater · Wisconsin · lists this city
    Not in EPA's PFAS sample
  • Mary Hill Park Sanitary District
    65 people · Groundwater · Wisconsin · lists this city
    Not in EPA's PFAS sample
  • Colonial Gardens Homes Water System
    48 people · Groundwater · Wisconsin · lists this city
    Not in EPA's PFAS sample

How nearby cities compare

CityMain water systemPFASLead (90th pct.)
Oshkosh 18 mi
Oshkosh Waterworks
Oshkosh WaterworksNone above limits6.1 ppb
Neenah 27 mi
Neenah Waterworks
Neenah WaterworksNone above limits10 ppb
West Bend 28 mi
West Bend Waterworks
West Bend WaterworksNone above limits5.8 ppb
Appleton 35 mi
Appleton Waterworks
Appleton WaterworksNone above limits1.3 ppb
Sheboygan 35 mi
Sheboygan Water Utilities
Sheboygan Water UtilitiesNone above limits2.2 ppb
Manitowoc 44 mi
Manitowoc Waterworks
Manitowoc WaterworksNone above limits7.7 ppb
Fond du Lac ZIP codes (1)
  • 54935

Questions

Is Fond du Lac tap water safe to drink?

Fond du Lac Waterworks had 1 health-based violation since 2016. Utility data can't show lead from your own pipes: if your home was built before 1986, test your tap. Your utility's annual Consumer Confidence Report is the official summary.

Who supplies water in Fond du Lac, WI?

6 public water systems serve parts of Fond du Lac. The largest is Fond du Lac Waterworks (44,678 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Fond du Lac tap water have PFAS?

None detected above EPA's reporting limits. Fond du Lac Waterworks had no PFAS detected in EPA's 2023–2025 testing. "Not detected" means below the reporting limit (about 2 to 20 ppt), not proven zero.

Do Fond du Lac homes have lead pipes?

Census estimates put 66% of Fond du Lac homes as built before 1980 (Wisconsin: 57%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. Fond du Lac Waterworks's service line inventory says what your line is made of. The only way to know for your home is to check the line where it enters the house and test your tap.

Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.