| Company | Location | Certifications | License # |
|---|---|---|---|
| Beshirs Septic Service | Madill, OK | Septage Hauler | 779 |
| Grotts Landscaping | Kingston, OK | Installer (Subsurface, Aerobic Spray) | 411 |
| Hale Excavating | Madill, OK | Installer (Subsurface, Lagoon) | 185 |
| Hale Septic | Madill, OK | Installer (Aerobic Spray) | 1081 |
| Hale Septic | Madill, OK | Septage Hauler | 596 |
| Monroes Construction | Kingston, OK | Installer (Subsurface, Aerobic Spray) | 1036 |
| Octo-Pump LLC | Kingston, OK | Septage Hauler | 765 |
| Standard Construction & Environmental | Kingston, OK | Installer (Subsurface, Lagoon, Aerobic Spray) | 802 |
| Standard Construction & Environmental Service | Kingston, OK | Septage Hauler | 482 |
| Texoma Clean Marine LLC | Pottsboro, OK | Septage Hauler | 844 |
10 companies in the Oklahoma DEQ certified septic installers and licensed septage pumpers/transporters are based in Marshall County as of 2026-07-23. Companies based elsewhere in Oklahoma also commonly serve the county.
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