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Is Beloit, WI tap water safe?

City of Beloit serves Beloit, 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

City of Beloit serves Beloit. In EPA’s and Wisconsin’s records it has 3 results above the health goal, and 2 health-based violations since 2016.

The worst: Lead at 4.5 ppb, above the health goal. Health goals are stricter than legal limits and are not enforced.

The water from City of Beloit is very hard, typically 337 mg/L (19.7 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 City of Beloit’s water.

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Every claim, and more filters, in the full report

Water testing near Beloit

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

  • Janesville Wastewater Lab

    Janesville, WI · about 9 miles

    Certified for bacteria

    (608) 755-3120

  • Rock County Health Department

    Janesville, WI · about 10 miles

    Certified for bacteria, nitrate

    (608) 757-5442

  • Green County Public Health Water Lab

    Monroe, WI · about 28 miles

    Certified for bacteria, nitrate

    (608) 328-9390

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 Beloit

Which ZIP codes are in Beloit: 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 Beloit

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

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