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Is Mequon, WI tap water safe?

15 utilities serve Mequon, 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

2 of the 15 utilities serving Mequon have a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Wisconsin’s records: Mequon Trail Townhomes and Vintage Estates.

Mequon Water Utility, which serves the most people here, has 1 result above the health goal. The worst: Lead at 0.52 ppb, above the health goal. Health goals are stricter than legal limits and are not enforced.

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 Mequon’s ZIP codes, from EPA’s estimates.

5 more utilities in Mequon

By EPA’s estimate, each serves fewer people in Mequon than those above.

  • Williamsburg 206serves 48 people · nearly all in Mequon · no health-based violations since 2016
  • Grand Ave Apartmentsserves 80 people · nearly all in Mequon · no health-based violations since 2016
  • Woodridge Estatesserves 100 people · nearly all in Mequon · no health-based violations since 2016
  • Alberta Subdivisionserves 75 people · nearly all in Mequon · no health-based violations since 2016
  • Village Heightsserves 130 people · nearly all in Mequon · no health-based violations since 2016

What handles it

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

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Every claim, and more filters, in the full report

Water testing near Mequon

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 Mequon, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Water Diagnostics Laboratories

    Mequon, WI · about 2 miles

    Certified for bacteria, nitrate

    (414) 350-1100

  • City of Milwaukee Health Department Lab

    Milwaukee, WI · about 13 miles

    Certified for bacteria, lead and copper

    (414) 286-3526

  • Washington Ozaukee Public Health Department

    Port Washington, WI · about 14 miles

    Certified for bacteria

    (262) 284-8170

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 Mequon

Which ZIP codes are in Mequon: 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 Mequon

Other towns in Ozaukee County with a page of their own.

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