Well water testing labs in Grayson County, TX
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.
2 accredited labs listed in Grayson County. Bacteria tests usually need a sterile bottle from the lab and delivery within about 30 hours, so check the lab's sample rules before you collect.
Quick answer
| Lab | City | Bacteria | Published price | Phone |
|---|---|---|---|---|
| City of Denison Laboratory | Denison | Yes | Call | (903) 464-4482 |
| City of Sherman Utilities Laboratory | Sherman | Yes | Call | (903) 892-7287 |
City of Denison Laboratory
4631 Randell Lake Road, Denison, TX 75020 · map (OpenStreetMap)
Phone: (903) 464-4482
Bacteria (total coliform / E. coli)
City of Sherman Utilities Laboratory
288 Post Oak Road, Sherman, TX 75090 · map (OpenStreetMap)
Phone: (903) 892-7287
Bacteria (total coliform / E. coli)
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