City of Garland Water Utilities Lab
2500 E. Centerville Road
Garland, TX 75040
- Total coliform & E. coli
Well water testing in Dallas County, Texas
Labs copied from the official Texas certified lab list (last verified 2026-10-26). All Texas labs
The official Texas list shows 4 certified labs in Dallas County. Call before you sample to confirm the lab accepts private well water and to ask about bottles, prices and drop-off times.
Certified labs in Dallas County
Eurofins Xenco, LLC -Dallas
9701 Harry Hines Boulevard
Dallas, TX 75220
- Total coliform & E. coli
North Texas Municipal Water District Laboratory
810 North Highway 78, Operations Bldg C
Wylie, TX 75098
- Total coliform & E. coli
- Lead & copper
- Water quality parameters
Trinity River Authority Central Regional Laboratory
6500 West Singleton Boulevard
Dallas, TX 75212
- Total coliform & E. coli
- Lead & copper
- Water quality parameters
Treatment partner for Dallas County
DFW Water Softeners LLC
Our exclusive water treatment partner for Denton, Collin, Wise, Dallas and Tarrant counties. Based in Flower Mound, serving Dallas–Fort Worth. If a certified lab result shows a problem such as hardness, iron or bacteria, they can quote treatment.
Visit DFW Water Softeners LLC Call 469-679-1788 Request a quote here
Partner listing. Test with a certified lab first; treatment should match your results. See our affiliate disclosure.
Get a free quote from a local well treatment pro in Texas
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What to test for
- TCEQ says testing for total coliform and E. coli by an accredited lab is the first step to finding out whether your well is contaminated, for example after flooding, a loss of water pressure, or recurring digestive problems. Ask the lab for a sterile container and sampling form; results usually take two to three days. Source
- If total coliform is found, TCEQ says not to use the water for drinking, bathing, cooking or washing dishes. Boil or disinfect it, or use bottled water, disinfect the well, and retest until the lab reports total coliform absent. Source
After a flood in Dallas County
EPA says to test a private well for bacteria after flooding before drinking the water again. Check current flood alerts and Flood Watch, and read flood season testing. EPA: your well after a flood
Local help
Your Dallas County or local health department can tell you about local well testing, including any free or low-cost programs. State contact: TCEQ (help finding a drinking water lab).
Questions
Where can I test well water in Dallas County, TX?
The official Texas certified lab list shows 4 labs in Dallas County; they are listed on this page with phone numbers. Call first to confirm they accept private well samples.
How often should I test my well?
EPA recommends testing every year for total coliform bacteria, nitrates, total dissolved solids and pH, and testing right away after flooding, well repairs, or a change in taste, color or smell.
Other Texas counties
Angelina County · Bastrop County · Bexar County · Bowie County · Brazoria County · Brazos County · Cameron County · Collin County · Comanche County · Denton County · Ector County · El Paso County · Erath County · Fort Bend County · Grayson County · Gregg County · Guadalupe County · Harris County · Hays County · Hidalgo County · Hill County · Hutchinson County · Kerr County · Llano County · Lubbock County · McLennan County · Midland County · Montgomery County · Nacogdoches County · Nolan County · Nueces County · Orange County · Polk County · Randall County · San Jacinto County · Smith County · Tarrant County · Taylor County · Tom Green County · Travis County · Victoria County · Walker County · Webb County · Wichita County · Williamson County · Wise County