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Certified Water Testing Labs in Wisconsin

52 laboratories certified for drinking-water testing, from the Wisconsin certification registry. Call ahead — most labs mail sample bottles and accept walk-in drop-offs.

Test your water first: A certified mail-in test kit screens for 50+ contaminants — bacteria, nitrates, metals, hardness — with lab-grade results, so you know exactly what (if anything) your well needs treated before spending on equipment.
LabCityCountyPhoneScope
Bayfield County Health Dept.WashburnBayfield(715) 373-61091 certified tests
Branch River Testing Services LLCGreenleafBrown(920) 532-00162 certified tests
Brown County Public Health DepartmentGreen BayBrown(920) 448-64001 certified tests
Pace Analytical Services,LLC-Green Bay WIGreen BayBrown(920) 469-24363 certified tests
SWD Labs, LLCRandolphColumbia(920) 326-51931 certified tests
Wisconsin State Laboratory of HygieneMadisonDane(800) 442-461834 certified tests
Watertown Department of Public Health LaboratoryWatertownDodge(920) 262-80901 certified tests
Douglas County HHS LaboratorySuperiorDouglas(715) 395-14382 certified tests
Commercial Testing Laboratory Inc.ColfaxDunn(715) 962-312115 certified tests
Dunn County Health DepartmentMenomonieDunn(715) 232-23882 certified tests
Eau Claire City-County Health DepartmentEau ClaireEau Claire(715) 839-287018 certified tests
Northern Lake Service Inc. (Crandon)CrandonForest(715) 478-277781 certified tests
LV Labs WW, LLCLancasterGrant(608) 723-40961 certified tests
Iron County Health DepartmentHurleyIron(715) 561-21912 certified tests
Jackson County Public Health Water LabBlack River FallsJackson(715) 284-43012 certified tests
Kenosha County Division of Health LabKenoshaKenosha(262) 605-67051 certified tests
Kenosha Water Utility - WPCKenoshaKenosha(262) 653-43351 certified tests
Analytichem LLCLuxemburgKewaunee(920) 866-39447 certified tests
White Water Associates, Inc. - WisconsinKewauneeKewaunee(920) 388-90672 certified tests
A1 Advanced Pumping Service, Inc.West SalemLa Crosse(608) 784-18882 certified tests
Davy LaboratoriesLa CrosseLa Crosse(608) 782-313062 certified tests
La Crosse County HD Public Health LaboratoryLacrosseLa Crosse(608) 785-97335 certified tests
Lafayette County Health DepartmentDarlingtonLafayette(608) 776-48952 certified tests
Lab-Tech ServicesDeerbrookLanglade(715) 623-62811 certified tests
Lincoln County Health DepartmentMerrillLincoln(715) 536-03072 certified tests
AgSource LaboratoriesMarshfieldMarathon(715) 898-140217 certified tests
Marathon County Public Health LaboratoryWausauMarathon(715) 261-19081 certified tests
U.S. Water, LLCWestonMarathon(715) 842-221519 certified tests
City of Milwaukee Health Department LabMilwaukeeMilwaukee(414) 286-35261 certified tests
Eurofins S-F Analytical Laboratories Inc.New BerlinMilwaukee(262) 754-53006 certified tests
Milwaukee Water WorksMilwaukeeMilwaukee(414) 286-222619 certified tests
Badger Laboratories, Inc.NeenahOutagamie(920) 729-110042 certified tests
Clean Water Testing LLCAppletonOutagamie(920) 733-759021 certified tests
TG Analytical LaboratoriesGreenvilleOutagamie(920) 757-135523 certified tests
Fredonia Wastewater Treatment PlantFredoniaOzaukee(262) 483-02751 certified tests
Metiri - MequonMequonOzaukee(262) 539-23161 certified tests
Water Diagnostics LaboratoriesMequonOzaukee(414) 350-11001 certified tests
Polk County Health DepartmentBalsam LakePolk(715) 768-91172 certified tests
Badger Laboratories - Stevens PointStevens PointPortage(715) 544-49003 certified tests
UWSP Water and Environmental Analysis LabStevens PointPortage(715) 346-32091 certified tests
Rock County Health DepartmentJanesvilleRock(608) 757-54411 certified tests
CT LaboratoriesBarabooSauk(608) 356-276031 certified tests
Kohler Co., CHEM LabKohlerSheboygan(920) 457-444121 certified tests
Quality Water Testing, Inc.SomersetSt. Croix(715) 247-48731 certified tests
Medford Wastewater Treatment PlantMedfordTaylor(715) 748-41221 certified tests
Vernon County Health DepartmentViroquaVernon(608) 637-52512 certified tests
Walworth Co. Health & Human ServicesElkhornWalworth(262) 741-32001 certified tests
Northern Lake Service Inc. - WaukeshaWaukeshaWaukesha(262) 547-34066 certified tests
Waukesha Co Dept of Parks & Land Use – DEHWaukeshaWaukesha(262) 896-83001 certified tests
Waupaca County Environmental Microbiology LaboratoryWaupacaWaupaca(715) 258-63231 certified tests
UW-Oshkosh Env. Research & Innovation CtrOshkoshWinnebago(920) 424-31484 certified tests
Wood County Water LaboratoryWisconsin RapidsWood(715) 421-89112 certified tests

Get your well water tested

Private wells aren't covered by public water regulations — annual testing for bacteria, nitrates, and local contaminants is on you. Get a certified lab test kit or a treatment quote for your area.

Find testing & treatment options →

Lab test vs. mail-in kit — which do you need?

Use a state-certified lab when the result has to stand up officially: real-estate closings, FHA/VA/USDA loans, new-well certification, or a legal dispute. Use a mail-in screening kit for routine annual checks and troubleshooting taste, smell, or staining — it's cheaper and you sample on your own schedule. Many well owners do both: a certified test at purchase, kits in between.