Skip to content
TapBuff
ZIP

Is Fond du Lac, WI tap water safe?

7 utilities serve Fond du Lac, by EPA’s records. Here is what EPA’s and Wisconsin’s records show for each, against the legal limits and the stricter health goals.

Matched to your utility using EPA records.

The short answer

3 of the 7 utilities serving Fond du Lac have a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Wisconsin’s records: Fond Du Lac Waterworks, North Fond Du Lac Waterworks and Fond Du Lac TN Water Utility.

Fond Du Lac Waterworks, which serves the most people here, has 3 results above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 20 ppb, above EPA’s health benchmark. Health goals are stricter than legal limits and are not enforced.

The water from Fond Du Lac Waterworks is very hard, typically 375 mg/L (21.9 grains per gallon). How Wisconsin’s water compares.

A town can be served by more than one utility, and some homes are on private wells. The name on your water bill tells you which is yours, and your ZIP code narrows it down. They are listed by how many people each serves in Fond du Lac’s ZIP codes, from EPA’s estimates.

What handles it

Each of these is certified, on a certifier’s listing, for a result above a line in Fond Du Lac Waterworks’s water, which serves the most people here. Another utility’s report names what handles its own results.

Disclosure: TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money

Every claim, and more filters, in the full report

Water testing near Fond du Lac

A utility tests the water it sends out. A test of your own tap shows what your pipes add, and on a private well it is the only test there is. It takes a lab Wisconsin certifies.

The 3 labs Wisconsin certifies closest to Fond du Lac, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Fond du Lac County Health Department

    Fond du Lac, WI · about 1 mile

    Certified for bacteria

    (920) 929-3085

  • UW-Oshkosh Env. Research & Innovation Ctr

    Oshkosh, WI · about 20 miles

    Certified for bacteria, nitrate, metals

    (920) 424-3148

  • University of Wisconsin - Oshkosh

    Sturgeon Bay, WI · about 20 miles

    Certified for bacteria

    (920) 424-3148

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 Wisconsin

ZIP codes in Fond du Lac

Which ZIP codes are in Fond du Lac: Census 2020 relationship files. Which utilities serve them, and how many people: EPA SDWIS and EPA’s service area map. Each utility’s results: EPA UCMR 5, EPA SDWIS, and EPA’s and the state’s compliance monitoring, as its report lists them. How they are measured: methodology. Certified labs: Wisconsin DNR and DATCP, certified and approved drinking water laboratories; distances from the Census 2020 ZIP code tabulation area gazetteer.

Near Fond du Lac

Other towns in Fond du Lac County with a page of their own.

What to do next