Texas Department of State Health Services South Texas Laboratory
Water testing lab in Harlingen, Cameron County, Texas.
Independent directory. Listings come from the TCEQ Public Water System Lab Map Table (updated 03/26/2026). These labs are accredited for public drinking-water samples; call first to confirm they accept private-well samples, which tests they run, sample bottles, drop-off hours and price.
Texas Department of State Health Services South Texas Laboratory
1301 South Rangerville Road, Harlingen, TX 78552 · map (OpenStreetMap)
Phone: (956) 364-8746
Bacteria (total coliform / E. coli)