Guadalupe - Blanco River Authority Regional Laboratory
Water testing lab in Seguin, Guadalupe 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.
Guadalupe - Blanco River Authority Regional Laboratory
933 East Court Street, Seguin, TX 78155 · map (OpenStreetMap)
Phone: (830) 379-5822
Bacteria (total coliform / E. coli)Water quality parameters