Edwards Aquifer Research & Data Center, Texas State University
Water testing lab in San Marcos, Hays 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.
Edwards Aquifer Research & Data Center, Texas State University
220 East Sessoms Drive, San Marcos, TX 78666 · map (OpenStreetMap)
Phone: (512) 245-2329
Bacteria (total coliform / E. coli)Water quality parameters