Certified Lab Directory
Certified Water Testing Labs in Colorado
Not every lab that will take your money is approved to test drinking water. In Colorado, that approval comes from the Colorado Department of Public Health and Environment (CDPHE) — and it requires EPA-approved methods, annual proficiency tests, and on-site audits. Below are the 68 labs based in Colorado that currently hold it. If you're testing a private well, the EPA recommends doing this once a year, so it's worth finding one you like.
Certified drinking water labs in Colorado
CDPHE's report carries a column headed "Accepts Outside Samples," and it marks 40 of the 68 laboratories below as not accepting them. Those 40 are almost entirely city, water-district and other utility labs that test only their own systems — Denver Water and Rocky Mountain National Park among them. 28 are marked as accepting outside samples. The column below reproduces what CDPHE published; confirm with the lab before you send anything.
| Lab | City | Accepts Outside Samples |
|---|---|---|
| Sangre De Cristo Laboratory | Alamosa | Yes |
| Arvada, City of | Arvada | No |
| Eurofins Denver | Arvada | Yes |
| Eurofins Reservoirs Environmental, Inc. | Arvada | Yes |
| Aspen Consolidated San. Dist. | Aspen | No |
| Aurora, City of | Aurora | No |
| Eagle River W / S District | Avon | Yes |
| High Country Utility Services | Basalt | No |
| Gilpin County Public Health Agency | Black Hawk | Yes |
| Boulder, City of Drinking Water Lab | Boulder | No |
| Broomfield, City & County - WTP | Broomfield | No |
| Broomfield, City & County - WWTP | Broomfield | No |
| Mid Valley Metropolitan District | Carbondale | No |
| Plum Creek Water Reclamation Authority | Castle Rock | No |
| Clifton Water District - Lab | Clifton | No |
| Cherokee Metropolitan District Water Quality Laboratory | Colorado Springs | No |
| Colorado Springs Utilities | Colorado Springs | No |
| El Paso County Health Department | Colorado Springs | Yes |
| Widefield Water and Sanitation District Laboratory | Colorado Springs | No |
| Colorado Analytical Laboratory - Commerce City | Commerce City | Yes |
| South Adams County WSD | Commerce City | No |
| Craig, City of | Craig | No |
| Colorado Department of Health & Environment | Denver | Yes |
| Denver Water - National Western Complex | Denver | No |
| SGS North America, Inc. - Denver | Denver | Yes |
| Green Analytical Laboratories | Durango | Yes |
| La Plata County Water Quality Laboratory | Durango | Yes |
| Estes Park, Town of | Estes Park | No |
| Rocky Mountain National Park | Estes Park | No |
| GeoWater Services | Evergreen | Yes |
| T & H Services LLC - Lab AKA: KIRA - CSC | Fort Carson | No |
| Colorado State University | Fort Collins | Yes |
| Fort Collins, City of | Fort Collins | No |
| M.M.S Environmental Laboratories | Fort Collins | Yes |
| Soldier Canyon Water Quality Laboratory | Fort Collins | No |
| Technology Laboratory, Inc. | Fort Collins | Yes |
| Fort Morgan, City of | Ft. Morgan | Yes |
| Golden, City of | Golden | No |
| Hazen Research | Golden | Yes |
| North Table Mtn. W / S District | Golden | No |
| Grand Junction, City of - WQL | Grand Junction | No |
| Grand Junction, City of - WWTP AKA Persigo | Grand Junction | No |
| Mesa County Public Health Regional Laboratory | Grand Junction | Yes |
| Three Lakes W/S District | Grand Lake | No |
| IEH-Warren Analytical Laboratory | Greeley | Yes |
| Weld County Department of Public Health & Environment | Greeley | Yes |
| Gunnison, City of | Gunnison | No |
| Lafayette, City of | Lafayette | No |
| Colorado Analytical Laboratory - Lakewood | Lakewood | Yes |
| Consolidated Mutual Water Co. | Lakewood | No |
| Highlands Ranch Water and Sanitation District | Littleton | No |
| Longmont, City of | Longmont | No |
| EAnalytics Laboratory | Loveland | Yes |
| Loveland, City of - WQL | Loveland | No |
| Project 7 Water Authority | Montrose | No |
| Murray-Brown Laboratories, LLC. | Northglenn | Yes |
| Northglenn, City of | Northglenn | No |
| Ute Water Conservancy District | Palisade | No |
| Parker Water & Sanitation District | Parker | No |
| Pueblo Board of Water Works | Pueblo | No |
| Pueblo Department of Public Health and Environment | Pueblo | Yes |
| Snowmass W / S District | Snowmass Village | No |
| ACZ Laboratories, Inc. | Steamboat Springs | Yes |
| Routt County Env. Health Dept. | Steamboat Springs | Yes |
| Northeast Colorado Health Dept. | Sterling | Yes |
| Thornton, City of | Thornton | No |
| Westminster, City of | Westminster | No |
| SGS North America, Inc. - Wheat Ridge | Wheat Ridge | Yes |
Colorado Department of Public Health and Environment (CDPHE)'s published list does not include lab phone numbers, so none are shown here. Search the lab by name, or call the certification program below.
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 .
This table covers the 68 certified labs located in Colorado. The Colorado Department of Public Health and Environment (CDPHE) also certifies 28 labs based outside the state, which can often still run your sample — those are on the official list linked below.
Source: Colorado Department of Public Health and Environment (CDPHE), Laboratory Services Division, Drinking Water Laboratory Certification. Retrieved . List linked from https://cdphe.colorado.gov/dwlabs
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Get the Free Test KitHow lab certification works in Colorado
In Colorado, drinking water laboratories are certified by the Colorado Department of Public Health and Environment (CDPHE) under the Drinking Water Laboratory Certification. 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.
CDPHE publishes this list as a live report that carries no phone number and no website for any laboratory, so this page shows name and city only — we don't fill that gap with numbers the state didn't publish. Many entries are utility, municipal and county labs that test their own systems, which is why the table above reproduces CDPHE's "Accepts Outside Samples" column. CDPHE lists no phone line for drinking water lab certification either — questions go to cdphe_labcert@state.co.us.
Common questions about Colorado water testing labs
Who certifies water testing labs in Colorado?
The Colorado Department of Public Health and Environment (CDPHE), through the Drinking Water Laboratory Certification. The program follows the EPA's national framework for drinking water laboratory certification, which requires EPA-approved test methods, at least annual proficiency testing, and periodic on-site audits. Source: Colorado Department of Public Health and Environment (CDPHE), Laboratory Services Division (https://cdphe.colorado.gov/dwlabs) and EPA (epa.gov/dwlabcert).
How many certified labs are in Colorado?
68 certified drinking water labs are located in Colorado, as of the official list we pulled on August 7, 2026. The Colorado Department of Public Health and Environment (CDPHE) also certifies 28 labs based outside Colorado that can often still analyze your sample; those appear on the official list linked on this page. Certification changes throughout the year, so treat this as a starting point and confirm status with the lab. Source: Colorado Department of Public Health and Environment (CDPHE), Laboratory Services Division (https://cdphe.colorado.gov/dwlabs).
How often should I test my well water in Colorado?
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 Colorado 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 Colorado that were on the official list published by the Colorado Department of Public Health and Environment (CDPHE) as of August 7, 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 and it also includes certified labs based outside the state. 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).
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