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Is Thiensville, WI tap water safe?

15 utilities serve Thiensville, 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

None of the 15 utilities serving Thiensville has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Wisconsin’s records.

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

5 more utilities in Thiensville

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

  • Laurel Lakes 608serves 80 people · under 100 in Thiensville · no health-based violations since 2016
  • Waters Edge Condominium Associationserves 50 people · under 100 in Thiensville · no health-based violations since 2016
  • Laurel Lakes 508serves 50 people · under 100 in Thiensville · no health-based violations since 2016
  • Heidel Rd Apts 152serves 40 people · under 100 in Thiensville · no health-based violations since 2016
  • Linden Lane Apts 141serves 75 people · under 100 in Thiensville · 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 Thiensville

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 Thiensville, 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 3 miles

    Certified for bacteria, nitrate

    (414) 350-1100

  • City of Milwaukee Health Department Lab

    Milwaukee, WI · about 12 miles

    Certified for bacteria, lead and copper

    (414) 286-3526

  • M M S D Lab Services Central Lab

    Milwaukee, WI · about 14 miles

    Certified for bacteria

    (414) 277-6377

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 Thiensville

Which ZIP codes are in Thiensville: 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 Thiensville

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

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