Skip to content
TapBuff
ZIP

Is Grafton, WI tap water safe?

5 utilities serve Grafton, 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 5 utilities serving Grafton have a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Wisconsin’s records: Osprey Mobile Home Park and Stonecroft Condominium Assn.

Grafton Waterworks, which serves the most people here, has 2 results above the health goal. The worst: Lead at 3.3 ppb, above the health goal. Health goals are stricter than legal limits and are not enforced.

The water from Grafton Waterworks is very hard, typically 360 mg/L (21.1 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 Grafton’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 Grafton 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 Grafton

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

  • Washington Ozaukee Public Health Department

    Port Washington, WI · about 6 miles

    Certified for bacteria

    (262) 284-8170

  • Washington Ozaukee Public Health Department

    West Bend, WI · about 6 miles

    Certified for bacteria

    (262) 284-8170

  • Water Diagnostics Laboratories

    Mequon, WI · about 8 miles

    Certified for bacteria, nitrate

    (414) 350-1100

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 Grafton

Which ZIP codes are in Grafton: 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 Grafton

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

What to do next