Well water testing labs in Denton 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 Denton 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 Denton Municipal Laboratory | Denton | Yes | Call | (940) 349-8607 |
| City of Lewisville Environmental Control Services Laboratory | Lewisville | Yes | Call | (972) 219-3548 |
City of Denton Municipal Laboratory
1100 South Mayhill Road, Denton, TX 76208 · map (OpenStreetMap)
Phone: (940) 349-8607
Bacteria (total coliform / E. coli)
City of Lewisville Environmental Control Services Laboratory
897 Treatment Plant Road, Lewisville, TX 75057 · map (OpenStreetMap)
Phone: (972) 219-3548
Bacteria (total coliform / E. coli)
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