| Company | Location | Certifications | License # |
|---|---|---|---|
| Aaron's Shovel LLC | — | Installer | — |
| Bear River Rock Products | — | Installer | — |
| Broadhead's Backhoe Service | — | Installer | — |
| BSC Excavation | — | Installer | — |
| Campbell Plumbing and Heating | — | Installer | — |
| Coats & Coats LLC | Weston, ID | Pumper | — |
| D & S Construction | — | Installer | — |
| DBA Coats Rooter Service | — | Installer | — |
| Facer Excavation Inc. | — | Installer | — |
| Jjscreeding Inc. | — | Installer | — |
| Juniper Earthworks | — | Installer | — |
| K&M Construction and Fabrication | — | Installer | — |
| KCA Construction, Inc. | — | Installer | — |
| Mugzie's Septic Pumping | Preston, ID | Pumper | — |
| Riedesel Hauling & Excavation | — | Installer | — |
| Silver Line Excavation LLC | — | Installer | — |
| Silver Spurs Construction LLC | — | Installer | — |
| Sunrise Earthworks LLC | — | Installer | — |
| TD Contracting LLC | — | Installer | — |
19 companies in the Idaho DEQ permitted subsurface sewage disposal system installers and septic tank pumpers are based in Franklin County as of 2026-07-23. Companies based elsewhere in Idaho also commonly serve the county.
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