12 named for coliform bacteria itself on the list.
Per the state list or a state web page. Call to confirm.
Located outside Wyoming but on its list.
USGS estimate for Wyoming.
How many labs test for coliform bacteria in Wyoming
12 labs on Wyoming's official drinking-water lab list are certified to test for coliform bacteria. All 12 are named for coliform bacteria on the list. 6 of them are marked as taking samples from the public. They are listed first.
The list is published by the U.S. EPA Region 8 - Drinking Water Laboratory Certification (Wyoming has no state drinking-water program of its own: EPA Region 8 runs it and certifies Wyoming's labs). List version on file: Current as of February 2026 (page footer 2/17/2026). Fetched 2026-11-15 (UTC).
What this list covers. Only the labs that EPA Region 8 certifies itself are listed. EPA Region 8 also accepts labs certified by other states ("reciprocal certification"); those labs are not on this list.
Wyoming labs certified for coliform bacteria
Marked as taking public samples (6)
| Lab | Location | Bacteria certification | Public samples | Cert. expiry |
|---|---|---|---|---|
| Energy Laboratories Inc | Casper, WY | Named on the official list | Public samples: yes (per state) | 6/30/2026 (Inorganics, Radionuclides, Phase II synthetic organic chemicals, Phase V synthetic organic chemicals); 3/31/2026 (Micro) Date on list has passed |
| Energy Laboratories Inc | Gillette, WY | Named on the official list | Public samples: yes (per state) | 12/31/2026 |
| Teton County Water Laboratory | Jackson, WY | Named on the official list | Public samples: yes (per state) | 12/31/2028 |
| Town of Pinedale Microbiology Lab | Pinedale, WY | Named on the official list | Public samples: yes (per state) | 12/10/2028 |
| Wyoming Dept of Agriculture Analytical Services Laboratory | Laramie, WY | Named on the official list | Public samples: yes (per state) | 6/30/2027 |
| Wyoming Public Health Lab | Cheyenne, WY | Named on the official list | Public samples: yes (per state) | 12/31/2026 |
Other labs on the list (6)
| Lab | Location | Bacteria certification | Public samples | Cert. expiry |
|---|---|---|---|---|
| Lincoln Water Quality Lab | Afton, WY | Named on the official list | Public samples: ask the lab | 10/13/2027 |
| National Park Service Mammoth Water Quality Control Lab | Mammoth Hot Springs, WY | Named on the official list | Public samples: ask the lab | 12/31/2028 |
| Pace Analytical Services LLC WY | Sheridan, WY | Named on the official list | Public samples: ask the lab | 12/31/2026 |
| Sage West Healthcare - Lander (formerly Lander Regional Hospital) | Lander, WY | Named on the official list | Public samples: ask the lab | 12/31/2026 |
| Sweetwater County Health Department | Rock Springs, WY | Named on the official list | Public samples: ask the lab | 12/31/2026 |
| Cheyenne Board of Public Utilities | Cheyenne, WY | 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) | 12/15/2027 |
How the Wyoming list marks public samples (whole list). Yes for the 6 labs that Wyoming DEQ's Know Your Well page lists under "Find a Laboratory": "This information is provided to assist homeowners in finding an analytical laboratory for water analysis, inclusion on this list does not indicate WDEQ endorsement of the lab or the services provided." Call first. Not stated for the other 6 labs (utility, park, hospital and county labs). EPA's list itself is written for public water systems.
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 Wyoming
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]
Wyoming guidance that mentions coliform bacteria:
- Wyoming DEQ recommends testing for bacteria (E. coli, total coliform) and nitrates every year, and for arsenic, lead, copper, iron, manganese, sulfate and total dissolved solids every five years. It notes that uranium, radium, selenium and methane are also common in Wyoming groundwater, and that owners in areas of possible oil and gas development should test for more. [2]
About 119,066 people in Wyoming used private wells in 2015, by the USGS estimate of people on domestic self-supplied water. [3] 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: Wyoming.
Other tests in Wyoming
EPA Region 8 Certified Drinking Water Laboratories in Wyoming.
Official sourceSearch by city or ZIP among labs for coliform bacteria.
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