| Company | Location | Certifications | License # |
|---|---|---|---|
| Big Bob's Little Johns | Marlow, OK | Septage Hauler | 830 |
| Cousin Eddie LLC | Comanche, OK | Septage Hauler | 734 |
| Double L Oilfield and Septic | Marlow, OK | Septage Hauler | 309 |
| Edwards Enterprises Rental | Duncan, OK | Installer (Subsurface, Aerobic Spray) | 1021 |
| Edwards Enterprises Rental | Duncan, OK | Septage Hauler | 480 |
| Kar Equipment | Duncan, OK | Septage Hauler | 828 |
| Woolwine Backhoe Service | Marlow, OK | Installer (Subsurface, Lagoon, Aerobic Spray) | 307 |
7 companies in the Oklahoma DEQ certified septic installers and licensed septage pumpers/transporters are based in Stephens County as of 2026-07-23. Companies based elsewhere in Oklahoma also commonly serve the county.
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