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Is Delafield, WI tap water safe?

15 utilities serve Delafield, 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

6 of the 15 utilities serving Delafield have a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Wisconsin’s records: Sanctuary of Delafield, Knollcrest, Cambridge Place of Delafield and 3 more.

Hartland Waterworks, which serves the most people here, has 2 results above EPA’s new limit, which takes effect in 2029 and 3 results above the health goal. The worst: PFOS at 4.6 ppt, above EPA’s new limit, which takes effect in 2029.

The water from Hartland Waterworks is very hard, typically 440 mg/L (25.7 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 Delafield’s ZIP codes, from EPA’s estimates.

5 more utilities in Delafield

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

  • Nashotah Houseserves 350 people · under 100 in Delafield · no health-based violations since 2016
  • Lake Country Apartmentsserves 84 people · lists Delafield among the places it serves · no health-based violations since 2016
  • Apartments of Stoneridgeserves 75 people · lists Delafield among the places it serves · 1 health-based violation since 2016
  • Delafield Woods 411serves 40 people · lists Delafield among the places it serves · no health-based violations since 2016
  • Delafield Woods 828serves 40 people · lists Delafield among the places it serves · 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 Hartland Waterworks’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 Delafield

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

  • Waukesha Co Dept of Parks & Land Use – DEH

    Waukesha, WI · about 7 miles

    Certified for bacteria, nitrate

    (262) 896-8300

  • C & C Pumps LLC

    Hartford, WI · about 15 miles

    Certified for bacteria

    (262) 224-5576

  • Eurofins S-F Analytical Laboratories Inc.

    New Berlin, WI · about 17 miles

    Certified for bacteria, nitrate, lead and copper, metals

    (262) 727-6006

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 Delafield

Which ZIP codes are in Delafield: 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 Delafield

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

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