A-1 Advanced Pumping Service Inc
N4314 County Road M West Salem WI 54669-9526
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Well water testing labs in Wisconsin
Last verified October 28, 2026 against the official state list (official list, copied 2026-10-28).
These are labs on Wisconsin's official certified drinking water list (Wisconsin DNR certified bacteriological labs portal). Many of them test samples for public water systems; call before sampling to confirm a lab accepts private well samples and to ask about prices and drop-off hours.
Official list of certified labs in Wisconsin
Wisconsin Department of Agriculture, Trade, & Consumer Protection (microbiology) (lab certification) keeps the official list. Format: WI DW laboratory list (search DW microbiology).
Open the official list Certification program
Free or low-cost testing: some county health departments and extension offices run free or subsidized well tests, often after floods. We have not confirmed a statewide program here, so check with your county health department. EPA private well guidance
Certified labs (primary and secondary contaminants)
A. O. Smith Water Treatment (North America, Inc.)
1990 Prospect Crt Appleton WI 54914-9000
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Agsource Cooperative Services
3700 Downwind Dr Marshfield WI 54449
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Analytichem LLC
N9190 Bay Meadows Lane Luxemburg WI 54217-9639
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Appleton Water Treatment Facility
2281 Manitowoc Rd Menasha WI 54952-8924
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Ashland County Health & Human Services
630 Sanborn Ave Ashland WI 54806-3537
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Badger Laboratories, Inc.
2150 Memorial Dr Green Bay WI 54303
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Badger Laboratories, Inc.
3426 E Maria Dr Stevens Point WI 54481-1332
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Badger Laboratories, Inc.
501 W Bell St Neenah WI 54956
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Bayfield County Health Department
117 E 6Th St Washburn WI 54891
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Beloit Water Pollution Control Facility
555 Willowbrook Rd Beloit WI 53511-6901
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Branch River Testing Service, LLC.
693 Lamers Clancy Rd Greenleaf WI 54126
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Brookfield Water Utility
19700 Riverview Dr Brookfield WI 53045
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Brown County Health And Human Services
2198 Glendale Ave Green Bay WI 54303-6405
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Buffalo County Department Of Health And Human Services
407 S 2Nd St Alma WI 54610
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
C & C Pumps LLC
1480 State Road 83 Hartford WI 53027
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Chippewa County
711 N Bridge St Chippewa Fls WI 54729-1845
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Clark County Health Department
517 Court St Rm 105 Neillsville WI 54456-1982
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Commercial Testing Laboratory Inc
514 Main St Colfax WI 54730-0526
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
County Of Vernon
318 Fairlane Drive Viroqua WI 54665-6140
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Ct Laboratories, LLC
1230 Lange Crt Baraboo WI 53913
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Cudahy Water Utility
5110 S Lake Dr Cudahy WI 53110-6108
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Davy Engineering Company, Inc
115 6Th St S La Crosse WI 54601-4153
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Douglas County Health And Human Services
1316 N 14Th St Superior WI 54880
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Dunn County Health Department
3001 Us Highway 12 E Menomonie WI 54751-3045
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Eagle River Health Department Laboratory
330 Court St Eagle River WI 54521-8362
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Eurofins Microbiology Laboratories
2345 S 170Th St New Berlin WI 53151-2701
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Farm First Dairy Cooperative
200 E Kelso Rd Kaukauna WI 54130
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Florence County Health Department
501 Lake Ave Florence WI 54121-8805
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Fond Du Lac County Health Department
160 S Macy St Fond Du Lac WI 54935
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Grafton Water Utility
1860 9Th Ave Grafton WI 53024
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Green Bay Water Utility Lab
6183 Finger Rd Green Bay WI 54301
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Green County Public Health Department
N3152 State Road 81 Monroe WI 53566-9397
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Griesbach Corporation
N1022 Quality Dr Greenville WI 54942-8604
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Infrastructure Alternatives Inc
520 First Ave Antigo WI 54409
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Iowa County
303 W Chapel St Ste 2200 Dodgeville WI 53533-1450
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Iron County Health Department
210 5Th Ave N Hurley WI 54534-1386
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Jackson County Public Health
421 County Road R Black River Falls WI 54615
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Kenosha County Division Of Health
8600 Sheridan Rd Kenosha WI 53143
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Kohler Co.
444 Highland Dr Kohler WI 53044-1515
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Kwik Trip Inc*
2302 Kwik Trip Way La Crosse WI 54602-2107
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
La Crosse County Public Health Lab
300 4Th St N La Crosse WI 54601
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Lab Tech Services LLC
N6411 Vacha Lane Deerbrook WI 54424
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Lafayette County Health Department
729 Clay St Darlington WI 53530-1225
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Lake Geneva Utility Commission
361 W Main St Lake Geneva WI 53147
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Langlade County
1225 Langlade Rd Antigo WI 54409-2762
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Leuther Laboratories LLC
N1006 County Road M Coon Valley WI 54623-9519
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Lincoln County Health Dept.
607 N Sales St Merrill WI 54452
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Lv Labs Ww, LLC.
1001 S Madison St Lancaster WI 53813-0384
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
M M S D Lab Services Central Lab
250 W Seeboth St Milwaukee WI 53204
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Manitowoc Public Utilities
1303 8Th St Manitowoc WI 54220-5313
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Marathon County Public Health Lab
1000 Lakeview Dr Wausau WI 54403-6786
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Marquette County Health Department
428 Underwood Ave Montello WI 53949-9248
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Marshfield Utilities
1818 N Oak St Marshfield WI 54449
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Matrix Sciences International Inc
1110 S Huron Rd Green Bay WI 54311-8024
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Menasha Electric & Water Utility
57 Manitowoc St Menasha WI 54952-3226
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Menomonee Falls Water Utility
W152N8634 Margaret Rd Menomonee Falls WI 53051
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Menomonie Waste Water
620 11Th Ave W Menomonie WI 54751
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Monroe County Health Department
315 W Oak St Sparta WI 54656-2150
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Neenah Water Utility
234 S Park Ave Neenah WI 54956-3026
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
North Shore Water Commission
400 W Bender Rd Milwaukee WI 53217-4103
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Northern Lake Service, Inc.
2420 N Grandview Blvd Waukesha WI 54520
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Northern Lake Service, Inc.
400 N Lake Ave Crandon WI 54520
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Oneida County Health Department
100 W Keenan St Rhinelander WI 54501
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Outagamie County Public Health Lab
320 S Walnut St Appleton WI 54911
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Pace Analytical Services, LLC
1241 Bellevue St Green Bay WI 54302
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Polk County Health Department
100 Polk County Plaza Suite 180 Balsam Lake WI 54810-8009
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Public Health Madison & Dane County
210 Martin Luther King Jr Blvd Madison WI 53703
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Pure Water Labs, LLC
325 S Park St Reedsburg WI 53959-1906
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Pure Water Labs, LLC
924 Development Dr Unit C Lodi WI 53959-1906
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Racine Public Health Department
730 Washington Ave Racine WI 53403-1123
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Rock County Health Department Janesville
3328 Us Highway 51 N Janesville WI 53547-1088
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Rockford Water Division Environmental Lab
1111 Cedar St Rockford Il 61102
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Rusk County Health And Human Services
311 Miner Ave E Ladysmith WI 54848-2827
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
S & R Krizan Pump Service Incorporated
7465 S Loomis Rd Wind Lake WI 53185
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Sawyer County Health & Human Services
10610 Main St Hayward WI 54843-6586
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Sheboygan Water Utility
72 Park Ave Sheboygan WI 53081
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Slinger Water Utility
120 M-B-W Rd Slinger WI 53086-9022
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
South Milwaukee Water Utility
100 Marshall Ave South Milwaukee WI 53172-0130
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
State Laboratory Of Hygiene
2601 Agriculture Dr Madison WI 53707
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Stevens Point Water & Sewage
301 Bliss Ave Stevens Point WI 54481-0243
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Superior Water Light Power Co
1813 E 3Rd St Superior WI 54880
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Swd Labs LLC
N9935 Pleasant Rd Randolph WI 53956
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Tim Butterfield Drilling, Inc.
395 Reed St Somerset WI 54025
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Two Rivers Water & Light
1415 Lake St Two Rivers WI 54241
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
U.S. Water, LLC
6905 Venture Cir Weston WI 54476
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
University Of Wisconsin - Oshkosh
2041 Michigan St Sturgeon Bay WI 54901-3551
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
University Of Wisconsin - Oshkosh
1028 S 9Th St Manitowoc WI 54901-3551
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
University Of Wisconsin - Oshkosh
783 Pearl Ave Oshkosh WI 54901-3551
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
University Of Wisconsin - Oshkosh
5400 N Black Oak Lake Rd Land O Lakes WI 54901-3551
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
University Of Wisconsin - Superior
816 N 17Th St Superior WI 54880
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Walworth County Department Of Health & Human Services
1910 County Road Nn Elkhorn WI 53121
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Washington Ozaukee Public Health Department
121 W Main St Port Washington WI 53074-1813
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Washington Ozaukee Public Health Department
333 E Washington St West Bend WI 53074-1813
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Water & Environmental Analysis
800 Reserve St Stevens Point WI 54481
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Water Diagnostics Laboratories, LLC
8605 W Freistadt Rd Mequon WI 53097
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Water Quality Investigations
2581 State Hwy 92 Mt Horeb WI 53572-2419
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Watertown Department Of Public Health
515 S 1St St Watertown WI 53094-4409
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Waukesha County Department Of Parks & Land Use
515 W Moreland Blvd Waukesha WI 53188
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Waukesha Water Utility
115 Delafield St Waukesha WI 53187-1648
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Waupaca County Dhhs - Environmental Microbiology Laboratory
811 Harding St Waupaca WI 54981
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
White Water Associates, Inc.
223B Milwaukee St Kewaunee WI 54216
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Wisconsin Department Of Agriculture, Trade And Consumer Protection
2601 Agriculture Dr Madison WI 53718
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Wisconsin Rapids Water Utility
221 16Th St Wisconsin Rapids WI 54495-0399
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Wood County Health Department
111 W Jackson St Wisconsin Rapids WI 54495-2702
- Total coliform bacteria
Certified by Wisconsin for drinking water bacteria.
Get a free quote from a local well treatment pro in Wisconsin
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Flooding near you?
EPA says to test a private well for bacteria after a flood before drinking the water again. See current flood alerts, Flood Watch and our flood season testing guide. EPA: your well after a flood
Notes on this list
- Copied from the Wisconsin DNR portal of labs certified for drinking water bacteria testing. We left out city, village and utility labs. For nitrate, arsenic and other chemistry, use the DNR certified lab lists.
- A lab can be certified for some tests and not others. Ask which tests are certified for drinking water before you order.
- Prices are not on the state list. Ask the lab.
Recommended tests
- Every year, test for total coliform bacteria, nitrate, total dissolved solids and pH, as EPA recommends for private wells. Source
- Nitrate: USGS finds higher nitrate in shallow groundwater under farmland. Parts of Wisconsin are intensively farmed, so test nitrate every year, and before using the water for infant formula. Source
- Arsenic: USGS maps show naturally occurring arsenic in groundwater in parts of Wisconsin and its region. Test at least once, then as your lab or health department advises. Source
- PFAS: test if you live near an airport, military base, landfill, or industrial or firefighting-foam site. EPA explains private well PFAS testing. Source
- After flooding, test for bacteria before drinking the water again, as EPA advises. Source
State contacts
- Wisconsin Department of Agriculture, Trade, & Consumer Protection (microbiology) (lab certification): Official program page Source
Questions
Where can I get my well water tested in Wisconsin?
This page lists 105 labs from Wisconsin's official certified drinking water list. Call first to confirm the lab accepts private well samples. The full official list is linked on this page.
What should I test my Wisconsin well for?
EPA recommends a yearly test for total coliform bacteria, nitrate, total dissolved solids and pH. This page lists extra tests that matter in parts of the state, with sources.
Sources
- Wisconsin Department of Agriculture, Trade, & Consumer Protection (microbiology): drinking water laboratory certification program
- Wisconsin official list of certified drinking water labs
- EPA: State certification programs and lists of certified drinking water labs (PDF, Aug 2025)
- EPA: Protect your home's water (private wells)
Other states
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