Labs certified for coliform bacteria70
70 named for coliform bacteria itself on the list.
Marked as taking public samples0
Per the state list or a state web page. Call to confirm.
Out-of-state labs11
Located outside Illinois but on its list.
People on private wells (2015)1,151,113
USGS estimate for Illinois.
How many labs test for coliform bacteria in Illinois
70 labs on Illinois's official drinking-water lab list are certified to test for coliform bacteria. All 70 are named for coliform bacteria on the list. The Illinois list does not say which labs take samples from homeowners, so call a lab before you send one. 11 are located outside Illinois.
The list is published by the Illinois EPA - Environmental Laboratory Accreditation Program (IL ELAP, chemistry) and Illinois Department of Public Health (IDPH, water microbiology). List versions on file: 12/09/2025 (date in the file name; the PDF prints no date); Revision Date Thursday, December 4, 2025; TNI LAMS as fetched 2026-11-15; Revision Date Thursday, December 4, 2025. Fetched 2026-11-15 (UTC).
Illinois labs certified for coliform bacteria
| Lab | Location | Bacteria certification | Public samples | Cert. expiry |
|---|---|---|---|---|
| Aqua Illinois, Inc. | Danville, IL | Named on the official list | Public samples: ask the lab | Jan 2027 |
| Aqua Illinois, Inc. | Kankakee, IL | Named on the official list | Public samples: ask the lab | Dec 2026 |
| BAR Laboratory / Brown & Roberts, Inc. | Harrisburg, IL | Named on the official list | Public samples: ask the lab | Mar 2026 Date on list has passed |
| Carbondale Central Lab | Carbondale, IL | Named on the official list | Public samples: ask the lab | Oct 2026 Date on list has passed |
| Central Lake County J. A. W. A. | Lake Bluff, IL | Named on the official list | Public samples: ask the lab | Jan 2026 Date on list has passed |
| Charleston Water Lab | Charleston, IL | Named on the official list | Public samples: ask the lab | Jun 2026 Date on list has passed |
| City Water, Light & Power | Springfield, IL | Named on the official list | Public samples: ask the lab | Feb 2026 Date on list has passed |
| Clean Water Testing | Appleton, WI | Named on the official list | Public samples: ask the lab | Dec 2025 Date on list has passed |
| Culligan Analytical Laboratory | Rosemont, IL | Named on the official list | Public samples: ask the lab | 2/28/2027 (IL ELAP chemistry); Nov 2026 (IDPH microbiology) |
| Daily Laboratories | Peoria, IL | Named on the official list | Public samples: ask the lab | Nov 2026 |
| DuPage County Health Department | Wheaton, IL | Named on the official list | Public samples: ask the lab | Aug 2027 |
| EMSL Analytical | Cinnaminson, NJ | Named on the official list | Public samples: ask the lab | Jun 2026 Date on list has passed |
| ETP Labs, Inc. | Willowbrook, IL | Named on the official list | Public samples: ask the lab | Dec 2025 Date on list has passed |
| Eurofins Built Environment Testing Central-Chicago | Naperville, IL | Named on the official list | Public samples: ask the lab | Jan 2026 Date on list has passed |
| Eurofins Eaton Analytical, LLC -South Bend, IN | South Bend, IN | Named on the official list | Public samples: ask the lab | 9/30/2027 (IL ELAP chemistry); Jun 2026 (IDPH microbiology) Date on list has passed |
| Galesburg Laboratory | Galesburg, IL | Named on the official list | Public samples: ask the lab | Jun 2027 |
| Illinois American Water | Champaign, IL | Named on the official list | Public samples: ask the lab | Feb 2027 |
| Illinois American Water | E. St. Louis, IL | Named on the official list | Public samples: ask the lab | Jun 2027 |
| Illinois American Water | Peoria, IL | Named on the official list | Public samples: ask the lab | May 2026 Date on list has passed |
| Illinois American Water | Woodridge, IL | Named on the official list | Public samples: ask the lab | Jan 2027 |
| Key Laboratory Services, Inc. | Monticello, IL | Named on the official list | Public samples: ask the lab | May 2026 Date on list has passed |
| Lake County Environmental Laboratory | Libertyville, IL | Named on the official list | Public samples: ask the lab | 1/31/2027 (IL ELAP chemistry); Feb 2026 (IDPH microbiology) Date on list has passed |
| Lyons Labs | Stockton, IL | Named on the official list | Public samples: ask the lab | May 2027 |
| McHenry County Health Department | Woodstock, IL | Named on the official list | Public samples: ask the lab | Apr 2026 Date on list has passed |
| Microbac Laboratories, Inc. | Merrillville, IN | Named on the official list | Public samples: ask the lab | 6/30/2027 (IL ELAP chemistry); Mar 2026 (IDPH microbiology) Date on list has passed |
| Naperville Water & Reclamation | Naperville, IL | Named on the official list | Public samples: ask the lab | Jan 2026 Date on list has passed |
| National Testing Laboratories, Ltd. | Ypsilanti, MI | Named on the official list | Public samples: ask the lab | 4/30/2027 (IL ELAP chemistry); Nov 2027 (IDPH microbiology) |
| Nova Biologicals, Inc. | Conroe, TX | Named on the official list | Public samples: ask the lab | May 2026 Date on list has passed |
| O'Fallon Water Laboratory | Lebanon, IL | Named on the official list | Public samples: ask the lab | Jun 2027 |
| Pace Analytical (former McCoy & McCoy Labs) | Farmersburg, IN | Named on the official list | Public samples: ask the lab | Dec 2025 Date on list has passed |
| Pace Analytical Services, LLC – Hazelwood, Missouri | Hazelwood, MO | Named on the official list | Public samples: ask the lab | 8/31/2027 (IL ELAP chemistry); May 2026 (IDPH microbiology) Date on list has passed |
| Pace Analytical Services, LLC – McHenry, Illinois | McHenry, IL | Named on the official list | Public samples: ask the lab | 5/31/2027 (IL ELAP chemistry); Apr 2026 (IDPH microbiology) Date on list has passed |
| Pace Analytical Services, LLC.- Peoria | Peoria, IL | Named on the official list | Public samples: ask the lab | 7/31/2027 (IL ELAP chemistry); Jun 2026 (IDPH microbiology) Date on list has passed |
| Phigenics Analytical Services Laboratory | Warrenville, IL | Named on the official list | Public samples: ask the lab | Jul 2026 Date on list has passed |
| Precision Water Lab | Centralia, IL | Named on the official list | Public samples: ask the lab | Jan 2026 Date on list has passed |
| QC Analytical Services, LLC | Le Claire, IA | Named on the official list | Public samples: ask the lab | Oct 2026 Date on list has passed |
| Quad City Metallurgical Laboratory, Inc. | Davenport, IA | Named on the official list | Public samples: ask the lab | Jul 2027 |
| Rockford Water Division Environmental Laboratory | Rockford, IL | Named on the official list | Public samples: ask the lab | Aug 2026 Date on list has passed |
| Suburban Laboratories, Inc. | Geneva, IL | Named on the official list | Public samples: ask the lab | Feb 2027 |
| Teklab, Inc. | Collinsville, IL | Named on the official list | Public samples: ask the lab | May 2027 |
| Test, Inc. | Peru, IL | Named on the official list | Public samples: ask the lab | 4/30/2027 (IL ELAP chemistry); Nov 2027 (IDPH microbiology) |
| Water Lab (EJ Water Coop) | Dieterich, IL | Named on the official list | Public samples: ask the lab | Jan 2026 Date on list has passed |
| Will County Health Dept. - Environ. Health Lab. | Joliet, IL | Named on the official list | Public samples: ask the lab | 4/30/2027 (IL ELAP chemistry); Apr 2027 (IDPH microbiology) |
| Arlington Heights Public Works | Arlington Heights, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | May 2027 |
| Aurora Water Treatment Plant | Aurora, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Jun 2027 |
| Bloomington Water Department | Hudson, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Feb 2027 |
| City of Chicago, Water Purification Laboratories | Chicago, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | 7/31/2027 (IL ELAP chemistry); May 2026 (IDPH microbiology) Date on list has passed |
| Decatur Water Department | Decatur, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Jun 2027 |
| DeKalb Water Department | DeKalb, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Jan 2027 |
| Dixon Water Department | Dixon, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Mar 2027 |
| E. Moline Water Department | E Moline, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Jul 2026 Date on list has passed |
| Elgin Water Department | Elgin, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Jun 2027 |
| Evanston Water & Sewer Division | Evanston, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Mar 2027 |
| Freeport Department of Public Works | Freeport, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Oct 2027 |
| Glencoe Water Department | Glencoe, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Sep 2027 |
| Herscher Public Works | Herscher, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Oct 2027 |
| Highland Park Water Department | Highland Park, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Mar 2026 Date on list has passed |
| Joliet Sewage Treatment | Joliet, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Feb 2027 |
| Mattoon Water Department | Mattoon, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Feb 2026 Date on list has passed |
| Metropolitan Water Reclamation District | Cicero, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Oct 2026 Date on list has passed |
| Moline Water Department | Moline, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | May 2026 Date on list has passed |
| Normal Water Department | Normal, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Sep 2027 |
| North Shore Water Reclamation District | Gurnee, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Jun 2026 Date on list has passed |
| Quincy Water Department | Quincy, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Jan 2026 Date on list has passed |
| Rochelle Water Department | Rochelle, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Jun 2027 |
| Rock Island Water Department | Rock Island, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Jul 2026 Date on list has passed |
| St. Charles Environmental Laboratory, City of | St. Charles, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Mar 2027 |
| Utility Services Laboratory | Wanatah, IN | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Dec 2025 Date on list has passed |
| Wilmette Water Department | Wilmette, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Apr 2027 |
| Winnetka Water Department | Winnetka, IL | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Feb 2026 Date on list has passed |
How the Illinois list marks public samples (whole list). Not stated in the lists. IDPH marks each microbiology lab's 'Lab Type' (Commercial, Municipal or Health Department); that is not a statement about homeowners' samples.
Before you send a sample, call the lab to confirm it is currently certified for the exact test and method, that it accepts samples from homeowners, and how to collect and ship them. Status can change between list updates.
Why test for coliform bacteria in Illinois
About a third of the 397 domestic wells tested for bacteria in a national USGS study had total coliform. Read our coliform bacteria explainer.
EPA advises private-well owners to test every year for total coliform bacteria, nitrates, total dissolved solids and pH. [1]
Illinois guidance that mentions coliform bacteria:
- Illinois EPA recommends testing for bacteria at least once a year and for nitrate every year, and always testing for nitrate before giving well water to an infant. [2]
- Illinois EPA says your local health department is the best place to start. Most local health departments can test for coliform bacteria and nitrate. [3]
- IDPH's laboratories in Carbondale, Chicago and Springfield are certified to test drinking water for total coliforms and E. coli. They accept water samples only from regional, county or city environmental health staff. [4]
About 1,151,113 people in Illinois used private wells in 2015, by the USGS estimate of people on domestic self-supplied water. [5] Federal limits are written for public water systems, not private wells, so testing is up to the owner.
For tests that depend on your home (farms nearby, old plumbing, a new baby), use the which-tests checklist. When results arrive, check your numbers against EPA's limits. State guidance, county data and every lab: Illinois.
Other tests in Illinois
Nitrate testing26 labsArsenic testing24 labsLead testing27 labsPFAS testing17 labsUranium testing5 labsManganese testing25 labsVOC testing11 labs
Sources
- U.S. EPA, Protect your home's water
- Illinois EPA, Private Well Users: Well Water Testing
- Illinois EPA, Private Well Users: Where to Get Help
- Illinois Department of Public Health, Lab Testing & Services: Environmental Testing
- USGS, Estimated use of water in the United States, county-level data for 2015 (Dieter et al., ver. 2.0, 2018)
- IEPA Accredited Laboratories (Primary Labs / Secondary Labs) - Laboratories Accredited for Chemical Analysis + Illinois Department of Public Health - Certified Water Microbiology Laboratories + TNI LAMS fields of accreditation (Drinking Water, accrediting body IL ELAP) (official list)
- Illinois Department of Public Health - Certified Water Microbiology Laboratories (official list)
Certified as ofVaries by lab
IEPA Accredited Laboratories (Primary Labs / Secondary Labs) - Laboratories Accredited for Chemical Analysis + TNI LAMS fields of accreditation (Drinking Water, accrediting body IL ELAP).
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