Alamo Analytical Laboratories, Ltd.
10526 Gulfdale Street
San Antonio, TX 78216
- Lead & copper
- Water quality parameters
Well water testing in Bexar 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 Bexar 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 Bexar County
San Antonio Metropolitan Health District
2303 SE Military Drive
San Antonio, TX 78223
- Total coliform & E. coli
San Antonio Testing Laboratory, LLC
1610 South Laredo Street
San Antonio, TX 78207
- Total coliform & E. coli
- Lead & copper
- Water quality parameters
Wallgren Environmental Services dba Pollution Control Services
1532 Universal City Boulevard, Suite 100
Universal City, TX 78148
- Total coliform & E. coli
- Lead & copper
- Water quality parameters
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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 Bexar 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 Bexar 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 Bexar County, TX?
The official Texas certified lab list shows 4 labs in Bexar 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.
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