Certified Lab Directory
Certified Water Testing Labs in Wyoming
Wyoming is the odd one out. It has no state drinking water primacy, so laboratories here are certified by U.S. EPA Region 8 rather than by a Wyoming agency. The standard is the same one every state program runs on: EPA-approved methods, proficiency testing at least once a year, and periodic on-site audits. Below are the 12 certified labs in Wyoming from EPA Region 8's own list. Region 8 also accepts reciprocal certification from other states, so a lab outside Wyoming may be able to run your sample — ask.
Certified drinking water labs in Wyoming
| Lab | City | Phone |
|---|---|---|
| Lincoln Water Quality Lab | Afton | 307-885-9698 |
| Energy Laboratories Inc | Casper | 307-235-0515 |
| Cheyenne Board of Public Utilities | Cheyenne | (307) 635-7693 |
| Wyoming Public Health Lab | Cheyenne | 307-777-6066 |
| Energy Laboratories Inc | Gillette | 307-686-7175 |
| Teton County Water Laboratory | Jackson | 307-732-8463 |
| Sage West Healthcare - Lander (formerly Lander Regional Hospital) | Lander | 307-335-6246 |
| Wyoming Dept of Agriculture Analytical Services Laboratory | Laramie | 307-742-2984 |
| National Park Service Mammoth Water Quality Control Lab | Mammoth Hot Springs | 307-699-3675 |
| Town of Pinedale Microbiology Lab | Pinedale | 307-367-2348 |
| Sweetwater County Health Department | Rock Springs | 307-872-3930 |
| Pace Analytical Services LLC WY | Sheridan | 307-461-4938 |
Certification status changes — labs are added, dropped, and suspended throughout the year. Before you mail a sample, confirm the lab still holds certification for the specific test you need. This list was pulled from the official source on .
Source: U.S. EPA Region 8 (Wyoming has no state drinking-water primacy; EPA Region 8 certifies labs), EPA Region 8 Certified Drinking Water Laboratories in Wyoming (PDF). List dated February 2026; retrieved . (https://www.epa.gov/system/files/documents/2026-02/20260211_wy_r8ic_lablist.pdf)
Not sure you need a full lab test yet?
Start with our free test kit. It screens for hardness and total dissolved solids at your tap in about 60 seconds — enough to tell you whether there's something worth sending to a lab. We mail it free, no strings.
Get the Free Test KitHow lab certification works in Wyoming
In Wyoming, drinking water laboratories are certified by the U.S. EPA Region 8 under the EPA Region 8 Certified Drinking Water Laboratories in Wyoming. The program operates within the EPA's national framework for drinking water lab certification: labs must use EPA-approved analytical methods, successfully analyze proficiency-test samples at least annually for each certified method and analyte, and pass periodic on-site audits (EPA, epa.gov/dwlabcert). Certification is issued per method and per analyte — so a lab certified for bacteria testing isn't automatically certified for metals or radiochemistry. When you call, name the specific test you need.
Questions about a lab's certification status go to the program directly: (303) 462-9476.
Common questions about Wyoming water testing labs
Who certifies water testing labs in Wyoming?
U.S. EPA Region 8. Wyoming has no state drinking water primacy, so EPA Region 8 runs laboratory certification for the state directly under the EPA Region 8 Certified Drinking Water Laboratories program. The requirements are the same ones state programs run on: EPA-approved test methods, at least annual proficiency testing, and periodic on-site audits. Region 8 also accepts reciprocal certification from labs certified in other states. Source: U.S. EPA Region 8 certified laboratory list (epa.gov) and EPA (epa.gov/dwlabcert).
How many certified labs are in Wyoming?
12 certified drinking water labs are located in Wyoming, as of the official list we pulled on August 2, 2026. Certification changes throughout the year, so treat this as a starting point and confirm status with the lab. Source: U.S. EPA Region 8 (Wyoming has no state drinking-water primacy; EPA Region 8 certifies labs) (https://www.epa.gov/system/files/documents/2026-02/20260211_wy_r8ic_lablist.pdf).
How often should I test my well water in Wyoming?
The EPA recommends testing private wells annually for total coliform bacteria, nitrates, total dissolved solids, and pH — and testing immediately after flooding, well repairs, nearby construction, or any change in your water's taste, odor, or color. Your local health department can tell you which contaminants are common in Wyoming groundwater. Source: EPA, Protect Your Home's Water (epa.gov/privatewells).
Can I use a lab that isn't on this list?
This list covers labs located in Wyoming that were on the official list published by the U.S. EPA Region 8 as of August 2, 2026. Certification changes during the year, so a lab missing from this page may have been certified since then — the official source linked above always has the current list. What we'd avoid is any lab that can't show a current drinking water certification at all. The EPA's guidance is to only use certified laboratories for drinking water testing. Source: EPA, Protect Your Home's Water (epa.gov/privatewells).
What if the nearest certified lab is far from me?
Ask the lab about a mail-in collection kit — many certified labs ship one with instructions and pre-treated bottles. Timing matters for some tests (bacteria samples have a short window between collection and analysis), so follow the lab's collection instructions exactly. Your local health department is also worth a call; some offer private well testing for free. Source on health department testing: EPA, Protect Your Home's Water (epa.gov/privatewells).
Lab results came back with a problem?
High hardness, high TDS, or a contaminant above EPA limits can usually be treated at the house. Send us what the lab found and we'll build a filtration estimate around your report.
Get a Filtration QuoteAdvertising disclosure
The Very Good Water Company earns a referral fee when we connect you with a local water-treatment professional. We are independent — we are not paid to rank or recommend any specific brand or product.