Labs certified for coliform bacteria98
98 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 Texas but on its list.
People on private wells (2015)1,315,073
USGS estimate for Texas.
How many labs test for coliform bacteria in Texas
98 labs on Texas's official drinking-water lab list are certified to test for coliform bacteria. All 98 are named for coliform bacteria on the list. The Texas list does not say which labs take samples from homeowners, so call a lab before you send one. 11 are located outside Texas.
The list is published by the Texas Commission on Environmental Quality (TCEQ) - Laboratory Accreditation Program (NELAP). List version on file: Live database, searched 2026-11-15 ("accurate as of the date and time of the search"). Fetched 2026-11-15 (UTC).
Texas labs certified for coliform bacteria
| Lab | Location | Bacteria certification | Public samples | Cert. expiry |
|---|---|---|---|---|
| A & B Environmental Services, Inc. | Houston, TX | Named on the official list | Public samples: ask the lab | 3/31/2027 |
| Abilene - Taylor County Public Health District | Abilene, TX | Named on the official list | Public samples: ask the lab | 9/30/2027 |
| Analytical Environmental Laboratory, LLC | Tyler, TX | Named on the official list | Public samples: ask the lab | 10/31/2027 |
| Angelina and Neches River Authority Environmental Laboratory | Lufkin, TX | Named on the official list | Public samples: ask the lab | 10/31/2027 |
| Aqua-Tech Laboratories, Inc. | Bryan, TX | Named on the official list | Public samples: ask the lab | 8/31/2027 |
| B3 Labs | Spring, TX | Named on the official list | Public samples: ask the lab | 2/28/2027 |
| BCS Laboratories, Inc. | Gainesville, FL | Named on the official list | Public samples: ask the lab | 5/31/2027 |
| Bio Chem Lab, Inc. | West, TX | Named on the official list | Public samples: ask the lab | 4/30/2027 |
| BlueTriton Brands Dallas QA Lab | Dallas, TX | Named on the official list | Public samples: ask the lab | 7/31/2027 |
| Brazoria County Health Department Water Laboratory | Angleton, TX | Named on the official list | Public samples: ask the lab | 12/31/2026 |
| Cardinal Laboratories | Hobbs, NM | Named on the official list | Public samples: ask the lab | 4/30/2027 |
| City of Houston Health Department, Bureau of Laboratory Services | Houston, TX | Named on the official list | Public samples: ask the lab | 10/31/2027 |
| City of Laredo Public Health Department Laboratory | Laredo, TX | Named on the official list | Public samples: ask the lab | 10/31/2027 |
| Continental Water Laboratory | Sacramento, CA | Named on the official list | Public samples: ask the lab | 9/30/2027 |
| Culligan Analytical Laboratory | Rosemont, IL | Named on the official list | Public samples: ask the lab | 5/31/2027 |
| Eastex Environmental Laboratory, Inc. - Coldspring | Coldspring, TX | Named on the official list | Public samples: ask the lab | 10/31/2027 |
| Eastex Environmental Laboratory, Nacogdoches | Nacogdoches, TX | Named on the official list | Public samples: ask the lab | 1/31/2027 |
| Edwards Aquifer Research and Data Center | San Marcos, TX | Named on the official list | Public samples: ask the lab | 8/31/2027 |
| EMSL Analytical, Inc. | Cinnaminson, NJ | Named on the official list | Public samples: ask the lab | 8/31/2027 |
| Envirodyne Laboratories, Inc. | Stafford, TX | Named on the official list | Public samples: ask the lab | 7/31/2027 |
| Environmental Monitoring Laboratory, LLC | Hillsboro, TX | Named on the official list | Public samples: ask the lab | 5/31/2027 |
| Eurofins Built Environment Testing – Pasadena | Pasadena, TX | Named on the official list | Public samples: ask the lab | 7/31/2027 |
| Eurofins Dallas | Dallas, TX | Named on the official list | Public samples: ask the lab | 6/30/2027 |
| Eurofins El Paso | El Paso, TX | Named on the official list | Public samples: ask the lab | 4/30/2027 |
| Eurofins Environment Testing South Central-SATL | San Antonio, TX | Named on the official list | Public samples: ask the lab | 9/30/2027 |
| Eurofins Huntsville | Huntsville, TX | Named on the official list | Public samples: ask the lab | 11/30/2026 |
| Eurofins Lubbock | Lubbock, TX | Named on the official list | Public samples: ask the lab | 3/31/2027 |
| Eurofins Pomona | Pomona, CA | Named on the official list | Public samples: ask the lab | 9/30/2027 |
| Eurofins South Bend | South Bend, IN | Named on the official list | Public samples: ask the lab | 12/31/2026 |
| Guadalupe-Blanco River Authority Regional Laboratory | Seguin, TX | Named on the official list | Public samples: ask the lab | 5/31/2027 |
| International Water Quality Laboratory | El Paso, TX | Named on the official list | Public samples: ask the lab | 6/30/2027 |
| Lower Colorado River Authority - Environmental Laboratory Services | Austin, TX | Named on the official list | Public samples: ask the lab | 3/31/2027 |
| National Testing Laboratories, Ltd. | Ypsilanti, MI | Named on the official list | Public samples: ask the lab | 5/31/2027 |
| NELAnalytical | Winslow, ME | Named on the official list | Public samples: ask the lab | 10/31/2027 |
| Niagara Bottling, LLC | Howard, PA | Named on the official list | Public samples: ask the lab | 4/30/2027 |
| Northeast Texas Public Health District Laboratory | Tyler, TX | Named on the official list | Public samples: ask the lab | 3/31/2027 |
| Nova Biologicals, Inc. | Conroe, TX | Named on the official list | Public samples: ask the lab | 5/31/2027 |
| Pace Analytical National Center for Testing and Innovation – Victoria | Victoria, TX | Named on the official list | Public samples: ask the lab | 6/30/2027 |
| Pace Analytical Services, LLC - Ormond Beach FL | Ormond Beach, FL | Named on the official list | Public samples: ask the lab | 10/31/2027 |
| R&C Joy, Inc. | Katy, TX | Named on the official list | Public samples: ask the lab | 12/31/2026 |
| Red River Authority of Texas Environmental Services Laboratory | Wichita Falls, TX | Named on the official list | Public samples: ask the lab | 8/31/2027 |
| Sabine River Authority of Texas | Orange, TX | Named on the official list | Public samples: ask the lab | 4/30/2027 |
| San Antonio Metropolitan Health District | San Antonio, TX | Named on the official list | Public samples: ask the lab | 6/30/2027 |
| SKG Engineering, LLC | San Angelo, TX | Named on the official list | Public samples: ask the lab | 6/30/2027 |
| SPL, Inc – Kilgore | Kilgore, TX | Named on the official list | Public samples: ask the lab | 1/31/2027 |
| SPL, Inc. – Plano | Plano, TX | Named on the official list | Public samples: ask the lab | 4/30/2027 |
| SPL, Inc.-Conroe | Conroe, TX | Named on the official list | Public samples: ask the lab | 3/31/2027 |
| Sweetwater - Nolan County Health Department | Sweetwater, TX | Named on the official list | Public samples: ask the lab | 10/31/2027 |
| Tarrant County Public Health Laboratory | Fort Worth, TX | Named on the official list | Public samples: ask the lab | 1/31/2027 |
| Texas Department of State Health Services / South Texas Laboratory | Harlingen, TX | Named on the official list | Public samples: ask the lab | 3/31/2027 |
| Texas Department of State Health Services Laboratory - Austin | Austin, TX | Named on the official list | Public samples: ask the lab | 8/31/2027 |
| Texas Institute for Applied Environmental Research (TIAER) | Stephenville, TX | Named on the official list | Public samples: ask the lab | 1/31/2027 |
| Texas Research Institute for Environmental Studies | Huntsville, TX | Named on the official list | Public samples: ask the lab | 5/31/2027 |
| The Texas Water Lab | Waller, TX | Named on the official list | Public samples: ask the lab | 5/31/2027 |
| TRA RS&C Laboratory | Dallas, TX | Named on the official list | Public samples: ask the lab | 1/31/2027 |
| Trinity River Authority Lake Livingston Project Laboratory | Livingston, TX | Named on the official list | Public samples: ask the lab | 5/31/2027 |
| UGRA Environmental Laboratory | Kerrville, TX | Named on the official list | Public samples: ask the lab | 10/31/2027 |
| Victoria County Public Health Department Water Laboratory | Victoria, TX | Named on the official list | Public samples: ask the lab | 6/30/2027 |
| Wichita Falls - Wichita County Public Health District Laboratory | Wichita Falls, TX | Named on the official list | Public samples: ask the lab | 11/30/2026 |
| Aqua Water Supply Corporation | Bastrop, TX | 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) | 11/30/2026 |
| Brownsville Public Utilities Board Analytical Laboratory | Brownsville, TX | 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) | 3/31/2027 |
| City of Abilene Environmental Laboratory | Abilene, TX | 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) | 3/31/2027 |
| City of Amarillo Environmental Laboratory | Amarillo, TX | 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) | 6/30/2027 |
| City of Arlington Water Utilities Laboratory Services | Arlington, TX | 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) | 8/31/2027 |
| City of Austin Water Utility Laboratory Services Division | Austin, TX | 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) | 3/31/2027 |
| City of Beaumont Water Production Laboratory | Beaumont, TX | 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) | 10/31/2027 |
| City of Corpus Christi Water Utilities Laboratory | Corpus Christi, TX | 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) | 6/30/2027 |
| City of Dallas Water Utilities Bachman Water Treatment Plant Laboratory | Dallas, TX | 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) | 4/30/2027 |
| City of Dallas Water Utilities Eastside Drinking Water Laboratory | Sunnyvale, TX | 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) | 12/31/2026 |
| City of Dallas Water Utilities Elm Fork Plant Laboratory | Carrollton, TX | 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) | 5/31/2027 |
| City of Deer Park Surface Water Treatment Plant Laboratory | Deer Park, TX | 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) | 12/31/2026 |
| City of Denison Laboratory | Denison, TX | 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) | 6/30/2027 |
| City of Denton Municipal Laboratory | Denton, TX | 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) | 3/31/2027 |
| City of El Paso Department of Public Health | El Paso, TX | 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) | 4/30/2027 |
| City of Garland Water Utility Laboratory | Garland, TX | 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) | 11/30/2026 |
| City of Harlingen Waterworks System | Harlingen, TX | 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) | 5/31/2027 |
| City of Houston - Drinking Water Regulatory Compliance Laboratory | Houston, TX | 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) | 12/31/2026 |
| City of Huntsville Parker Creek Laboratory | Huntsville, TX | 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) | 1/31/2027 |
| City of Kerrville Laboratory | Kerrville, TX | 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) | 6/30/2027 |
| City of Lewisville Environmental Control Services Laboratory | Lewisville, TX | 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) | 5/31/2027 |
| City of Lubbock Water Treatment Plant Laboratory | Lubbock, TX | 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) | 6/30/2027 |
| City of McAllen Central Laboratory | McAllen, TX | 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) | 3/31/2027 |
| City of Midland Utilities Laboratory | Midland, TX | 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) | 12/31/2026 |
| City of Odessa Laboratory Services | Odessa, TX | 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) | 9/30/2027 |
| City of Pharr Water Laboratory | Pharr, TX | 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) | 12/31/2026 |
| City of Port Arthur Water Purification Plant Laboratory | Port Arthur, TX | 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) | 5/31/2027 |
| City of Round Rock Environmental Services Laboratory | Round Rock, TX | 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) | 5/31/2027 |
| City of San Angelo Water Quality Laboratory | San Angelo, TX | 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) | 5/31/2027 |
| City of Sherman Utilities Laboratory | Sherman, TX | 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) | 5/31/2027 |
| City of Texarkana Water Utilities Laboratory | Texarkana, TX | 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) | 6/30/2027 |
| City of Waco Regional Water Quality Laboratory | Waco, TX | 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) | 9/30/2027 |
| City of Wichita Falls Cypress Environmental Laboratory | Wichita Falls, TX | 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) | 6/30/2027 |
| Fort Worth Water Department Centralized Water & Wastewater Laboratory | Fort Worth, TX | 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) | 10/31/2027 |
| North Texas Municipal Water District Environmental Laboratory | Wylie, TX | 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) | 6/30/2027 |
| San Antonio Water System Environmental Laboratory | San Antonio, TX | 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) | 1/31/2027 |
| Upper Leon River Municipal Water District | Comanche, TX | 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) | 6/30/2027 |
| Wallgren Environmental Services, Inc. dba Pollution Control Services | Universal City, TX | 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) | 1/31/2027 |
| Water Utility Services, Inc. | Spring, TX | 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) | 8/31/2027 |
How the Texas list marks public samples (whole list). Not stated in the list. TCEQ marks each lab 'Commercial?' Yes/No; 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 Texas
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]
Texas guidance that mentions coliform bacteria:
- The Texas Well Owner Network (Texas A&M AgriLife Extension) recommends testing well water every year, at least for E. coli, even if the water looks and tastes fine. [2]
- The Texas Well Owner Network holds well water screening events, such as its June 2026 events in South Texas. Samples are screened for total coliform bacteria, E. coli, nitrate-nitrogen, arsenic and salinity, followed by a results meeting. At the June 2026 South Texas events the fee was $15 per sample in some areas (Robstown, Sinton and Refugio) and free in others, so check each event. [3]
- The Texas Water Development Board's groundwater monitoring program occasionally has funds to sample private wells case by case. It tests naturally occurring constituents only, not bacteria. [4]
- The State of Texas does not regulate the water quality of private wells. The Texas Water Development Board points owners to the TCEQ map of NELAP-accredited drinking water labs and says costs range from about $20 for a coliform and E. coli test up to $400 for a full drinking water standards analysis. [4]
About 1,315,073 people in Texas 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: Texas.
Other tests in Texas
Nitrate testing48 labsArsenic testing41 labsLead testing49 labsPFAS testing20 labsUranium testing25 labsManganese testing41 labsVOC testing23 labs
Sources
- U.S. EPA, Protect your home's water
- Texas A&M AgriLife Extension, Texas Well Owner Network, Frequently asked questions
- Texas Water Resources Institute (Texas A&M AgriLife), Private water well screenings set for South Texas June 22-26 (May 28, 2026)
- Texas Water Development Board, Resources for sampling private water wells
- USGS, Estimated use of water in the United States, county-level data for 2015 (Dieter et al., ver. 2.0, 2018)
- TCEQ Laboratory Approval Status - List of Accredited Laboratories (public database, Matrix: Drinking Water) (official list)
Certified as ofLive database, searched 2026-11-15 ("accurate as of the date and time of the search")
TCEQ Laboratory Approval Status - List of Accredited Laboratories (public database, Matrix: Drinking Water).
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