Labs certified for nitrate48
48 named for nitrate itself on the list.
Marked as taking public samples0
Per the state list or a state web page. Call to confirm.
Out-of-state labs20
Located outside Texas but on its list.
People on private wells (2015)1,315,073
USGS estimate for Texas.
How many labs test for nitrate in Texas
48 labs on Texas's official drinking-water lab list are certified to test for nitrate. All 48 are named for nitrate on the list. The Texas list does not say which labs take samples from homeowners, so call a lab before you send one. 20 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 nitrate
| Lab | Location | Nitrate 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 |
| A & B Environmental Services, Inc. Golden Triangle | Nederland, TX | Named on the official list | Public samples: ask the lab | 1/31/2027 |
| ACZ Laboratories, Inc. | Steamboat Springs, CO | Named on the official list | Public samples: ask the lab | 4/30/2027 |
| Alliance Technical Group, LLC - Akron | Cuyahoga Falls, OH | Named on the official list | Public samples: ask the lab | 7/31/2027 |
| Aqua-Tech Laboratories, Inc. | Bryan, TX | Named on the official list | Public samples: ask the lab | 8/31/2027 |
| Bio Chem Lab, Inc. | West, TX | Named on the official list | Public samples: ask the lab | 4/30/2027 |
| 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 |
| EMSL Analytical, Inc. | Cinnaminson, NJ | Named on the official list | Public samples: ask the lab | 8/31/2027 |
| Energy Laboratories, Inc. - Billings, MT | Billings, MT | 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 |
| Envirosource Corp. dba Green Analytical Laboratories | Durango, CO | Named on the official list | Public samples: ask the lab | 1/31/2027 |
| Eurofins Albuquerque | Albuquerque, NM | Named on the official list | Public samples: ask the lab | 5/31/2027 |
| Eurofins Houston | Stafford, TX | Named on the official list | Public samples: ask the lab | 6/30/2027 |
| Eurofins Lancaster Laboratories Environment Testing, LLC | Lancaster, PA | Named on the official list | Public samples: ask the lab | 8/31/2027 |
| Eurofins Orlando | Altamonte Springs, FL | Named on the official list | Public samples: ask the lab | 2/28/2027 |
| 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 |
| GEL Laboratories, LLC | Charleston, SC | Named on the official list | Public samples: ask the lab | 2/28/2027 |
| Guadalupe-Blanco River Authority Regional Laboratory | Seguin, TX | Named on the official list | Public samples: ask the lab | 5/31/2027 |
| Integrity Testing, Inc. | Austin, TX | Named on the official list | Public samples: ask the lab | 3/31/2027 |
| 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 |
| Pace Analytical National Center for Testing and Innovation | Mount Juliet, TN | Named on the official list | Public samples: ask the lab | 10/31/2027 |
| Pace Analytical Services, LLC - Ormond Beach FL | Ormond Beach, FL | Named on the official list | Public samples: ask the lab | 10/31/2027 |
| Pace Analytical Services, LLC - Salina KS | Salina, KS | Named on the official list | Public samples: ask the lab | 12/31/2026 |
| Pace Analytical Services, LLC - Westborough, MA | Westborough, MA | Named on the official list | Public samples: ask the lab | 10/31/2027 |
| 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 |
| SGS North America Inc - Wheat Ridge | Wheat Ridge, CO | Named on the official list | Public samples: ask the lab | 2/28/2027 |
| SPL - Reading | Reading, PA | Named on the official list | Public samples: ask the lab | 3/31/2027 |
| SPL, Inc – Kilgore | Kilgore, TX | Named on the official list | Public samples: ask the lab | 1/31/2027 |
| SPL, Inc.-Conroe | Conroe, 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 |
| TRA RS&C Laboratory | Dallas, TX | Named on the official list | Public samples: ask the lab | 1/31/2027 |
| UGRA Environmental Laboratory | Kerrville, TX | Named on the official list | Public samples: ask the lab | 10/31/2027 |
| US EPA/Region 8 Laboratory | Lakewood, CO | Named on the official list | Public samples: ask the lab | 9/30/2027 |
| 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 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 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 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 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 |
| 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 |
| 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 |
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 nitrate in Texas
Nitrate has no taste or smell, and a lab report can state the same water in two units that differ by a factor of 4.43. Read our nitrate 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 nitrate:
- 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. [2]
About 1,315,073 people in Texas 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: Texas.
Other tests in Texas
Bacteria testing98 labsArsenic testing41 labsLead testing49 labsPFAS testing20 labsUranium testing25 labsManganese testing41 labsVOC testing23 labs
Sources
- U.S. EPA, Protect your home's water
- Texas Water Resources Institute (Texas A&M AgriLife), Private water well screenings set for South Texas June 22-26 (May 28, 2026)
- 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).
Official source