| Company | Location | Certifications | License # |
|---|---|---|---|
| Air Md, Inc | Humboldt, TN | Installer (Type C) | 13444 |
| David Garmany Dozer Service | Humboldt, TN | Installer (Type C) | 11109 |
| Dickson Construction | Humboldt, TN | Installer (Type C) | 126 |
| Erby Knott Construction Company | Bradford, TN | Installer (Type C) | 7000 |
| Mp Construction | Humboldt, TN | Installer (Type C) | 11147 |
| Parham LLc | Trenton, TN | Installer (Type C) | 12639 |
| Reynolds Plumbing | Bradford, TN | Installer (Type C) | 18101 |
| Rowan Services | Humboldt, TN | Pumper | 857 |
| Southern Underground Utilities & Septic LLC | Trenton, TN | Installer | 18320 |
| The Outhouse Portable Toilets and Septic Service | Dyer, TN | Pumper | 965 |
| The Outhouse Portable Toilets And Septic Service , Tn | — | Installer (Type C) | 908 |
11 companies in the TDEC active septic system installers & pumpers lists are based in Gibson County as of 2026-07-23. Companies based elsewhere in Tennessee also commonly serve the county.
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