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Get your water tested in Illinois.

The labs Illinois certifies to test drinking water, from the state’s own list of Dec. 4, 2025. A lab test is the only way to know what is in your own tap or well.

The short answer

Illinois’s list has 30 labs certified to test drinking water: 19 in Illinois and 11 in other states. It also names 40 water utilities’ in-house labs, left out here because they test only their own systems’ water.

Illinois’s list covers bacteria. Illinois EPA accredits labs for other tests, such as nitrate or arsenic, on a list that doesn’t say which test drinking water.

Certification is test by test, so check that a lab is certified for what you want tested, and call first: it will say which bottles to use and how soon the sample has to arrive.

From the state

  • Illinois Department of Public Health

    Coliform bacteria and nitrate testing for private wells, with sample bottles from your local health department, or from the department's nearest regional office where there is none. You mail the sample to the lab, and results come back through the health department.

    Well Sampling for Coliform & Nitrate, Illinois Department of Public Health, checked Oct. 10, 2026

Labs in Illinois

19 labs, by city.

Labs in Illinois, certified by Illinois
LabCityPhoneCertified for
Precision Water LabCentralia(618) 533-0758Bacteria
Teklab, Inc.Collinsville(618) 344-1004Bacteria
Water Lab (EJ Water Coop)Dieterich(217) 925-5566Bacteria
Suburban Laboratories, Inc.Geneva(708) 544-3260Bacteria
BAR Laboratory / Brown & Roberts, Inc.Harrisburg(618) 252-8111Bacteria
Will County Health DepartmentJoliet(815) 727-8517Bacteria
Lake County Environmental LaboratoryLibertyville(847) 377-8017Bacteria
Pace Analytical Services, LLC - McHenryMcHenry(815) 344-4044Bacteria
Key Laboratory Services, Inc.Monticello(217) 875-2691Bacteria
Eurofins Built Environment Testing Central-ChicagoNaperville(331) 330-2066Bacteria
Daily LaboratoriesPeoria(309) 691-4513Bacteria
Pace Analytical Services, LLC - PeoriaPeoria(309) 683-1766Bacteria
Test, Inc.Peru(815) 224-1650Bacteria
Culligan Analytical LaboratoryRosemont(847) 430-1284Bacteria
Lyons LabsStockton(815) 947-3360Bacteria
Phigenics Analytical Services LaboratoryWarrenville(844) 850-4087Bacteria
DuPage County Health DepartmentWheaton(630) 221-7177Bacteria
ETP Labs, Inc.Willowbrook(630) 891-3392Bacteria
McHenry County Health DepartmentWoodstock(815) 334-4585Bacteria

Labs in other states

11 labs Illinois certifies outside the state, by state and city. Ask whether a lab takes samples by mail, and how fast they have to arrive.

Labs in other states, certified by Illinois
LabCityPhoneCertified for
Quad City Metallurgical Laboratory, Inc.Davenport, IA(563) 386-7827Bacteria
QC Analytical Services, LLCLe Claire, IA(563) 289-3373Bacteria
Pace Analytical (former McCoy & McCoy Labs)Farmersburg, IN(812) 696-5076Bacteria
Microbac Laboratories, Inc.Merrillville, IN(219) 769-8378Bacteria
Eurofins Eaton Analytical, LLCSouth Bend, IN(574) 472-5515Bacteria
Utility Services LaboratoryWanatah, IN(219) 759-0193Bacteria
National Testing Laboratories, Ltd.Ypsilanti, MI(734) 483-8333Bacteria
Pace Analytical Services, LLC - HazelwoodHazelwood, MO(314) 432-0550Bacteria
EMSL AnalyticalCinnaminson, NJ(856) 303-2584Bacteria
Nova Biologicals, Inc.Conroe, TX(936) 756-5333Bacteria
Clean Water TestingAppleton, WI(920) 733-7590Bacteria

What to ask a lab to test

Source: Illinois Department of Public Health, certified water microbiology laboratories, dated Dec. 4, 2025, read Oct. 10, 2026. Labs are listed as the state lists them; what each is certified for is as far as the list says. Certifications change, so a lab’s own word is the latest.

A lab named for a water utility is listed apart. Distances on town pages are straight lines between ZIP code centers from the Census 2020 gazetteer. How labs are listed here.

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