41 named for arsenic itself on the list.
Per the state list or a state web page. Call to confirm.
Located outside Texas but on its list.
USGS estimate for Texas.
How many labs test for arsenic in Texas
41 labs on Texas's official drinking-water lab list are certified to test for arsenic. All 41 are named for arsenic on the list. The Texas list does not say which labs take samples from homeowners, so call a lab before you send one. 21 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 arsenic
| Lab | Location | Arsenic 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 |
| ACZ Laboratories, Inc. | Steamboat Springs, CO | Named on the official list | Public samples: ask the lab | 4/30/2027 |
| Alamo Analytical Laboratories, Ltd. | San Antonio, TX | Named on the official list | Public samples: ask the lab | 3/31/2027 |
| 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 |
| Columbia Laboratories - Portland | Portland, OR | Named on the official list | Public samples: ask the lab | 12/31/2026 |
| 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 |
| 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 |
| Envirosource Corp. dba Green Analytical Laboratories | Durango, CO | Named on the official list | Public samples: ask the lab | 1/31/2027 |
| 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 |
| Integrity Testing, Inc. | Austin, TX | Named on the official list | Public samples: ask the lab | 3/31/2027 |
| 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 |
| 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 - Mansfield, MA (320 Forbes) | Mansfield, MA | Named on the official list | Public samples: ask the lab | 10/31/2027 |
| Pace Analytical Services, LLC - Minneapolis MN | Minneapolis, MN | Named on the official list | Public samples: ask the lab | 2/28/2027 |
| 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 - Peoria | Peoria, IL | Named on the official list | Public samples: ask the lab | 9/30/2027 |
| 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 |
| 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 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 |
| 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 arsenic in Texas
Arsenic is invisible, tasteless and mostly natural, and it comes in two forms that respond very differently to treatment. Read our arsenic explainer.
Texas guidance that mentions arsenic:
- 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. [1]
USGS estimates that the most private-well users with arsenic above 10 µg/L, EPA's limit for public water, live in Lubbock County, Midland County and Harris County (about 11,642 people in Lubbock County, 2010 base year). USGS describes this kind of estimate as useful "for broad screening of the population at risk", so it says nothing certain about any one well. [2]
Show the numbers
| Item | Value | Note |
|---|---|---|
| Lubbock County | 11,642 people (2010 base year) | |
| Midland County | 7,306 people (2010 base year) | |
| Harris County | 6,396 people (2010 base year) | |
| Ector County | 5,449 people (2010 base year) | |
| Montgomery County | 3,720 people (2010 base year) | |
| Bee County | 3,412 people (2010 base year) |
USGS model estimate for broad screening, not a measurement of any well. Only a test tells you about your own well. Source: USGS, Estimated county level domestic well population with arsenic greater than 10 micrograms per liter (Ayotte, Medalie and Qi, 2017), accessed 2026-11-01.
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
- Texas Water Resources Institute (Texas A&M AgriLife), Private water well screenings set for South Texas June 22-26 (May 28, 2026)
- USGS, Estimated county level domestic well population with arsenic greater than 10 micrograms per liter (Ayotte, Medalie and Qi, 2017)
- 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)
TCEQ Laboratory Approval Status - List of Accredited Laboratories (public database, Matrix: Drinking Water).
Official source