City of Denison Laboratory
Water testing lab in Denison, Grayson 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.
City of Denison Laboratory
4631 Randell Lake Road, Denison, TX 75020 · map (OpenStreetMap)
Phone: (903) 464-4482
Bacteria (total coliform / E. coli)