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Is Williams Bay, WI tap water safe?

Williams Bay Waterworks serves Williams Bay, by EPA’s records. Here is what EPA’s and Wisconsin’s records show for it, against the legal limits and the stricter health goals.

Matched to your utility using EPA records.

The short answer

Williams Bay Waterworks serves Williams Bay. In EPA’s and Wisconsin’s records it has 1 result above the action level and 1 result above the health goal, and 1 health-based violation since 2016.

The worst: Lead at 45 ppb, above the action level.

The water from Williams Bay Waterworks is moderately hard, typically 96 mg/L (5.6 grains per gallon). How Wisconsin’s water compares.

Some homes in a town are on private wells or a small system of their own. The name on your water bill tells you which is yours.

What handles it

Each of these is certified, on a certifier’s listing, for a result above a line in Williams Bay Waterworks’s water.

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Every claim, and more filters, in the full report

Water testing near Williams Bay

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

  • Lake Geneva Utility Commission

    Lake Geneva, WI · about 5 miles

    Certified for bacteria

    (262) 248-2311 ext. 406

  • Walworth Co. Health & Human Services

    Elkhorn, WI · about 9 miles

    Certified for bacteria, nitrate

    (262) 741-3200

  • S & R Krizan Pump Service Incorporated

    Wind Lake, WI · about 23 miles

    Certified for bacteria

    (262) 895-6454

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 Williams Bay

Which ZIP codes are in Williams Bay: 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 Williams Bay

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

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