Skip to content
TapBuff
ZIP

Is Merton, WI tap water safe?

2 utilities serve Merton, 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

1 of the 2 utilities serving Merton has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Wisconsin’s records: Sussex Village Hall & Water Utility.

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 Merton’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 Hartland 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 Merton

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 Merton, 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 8 miles

    Certified for bacteria, nitrate

    (262) 896-8300

  • C & C Pumps LLC

    Hartford, WI · about 13 miles

    Certified for bacteria

    (262) 224-5576

  • Eurofins S-F Analytical Laboratories Inc.

    New Berlin, WI · about 15 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 Merton

Which ZIP codes are in Merton: 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 Merton

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

What to do next