| Company | Location | Certifications | License # |
|---|---|---|---|
| Affordable Dirt Work | Salmon, ID | Installer | — |
| Boyd Foster Backhoe Service | Leadore, ID | Installer | — |
| Down To Earth Excavation LLC | Salmon, ID | Installer | — |
| England Construction | North Fork, ID | Installer | — |
| Greg Roach Grading and Excavation Inc | Salmon, ID | Installer | — |
| High Bar Construction LLC | Salmon, ID | Installer | — |
| Pep's Septic Service | Salmon, ID | Pumper | — |
| Salmon River Excavation LLC | North Fork, ID | Installer | — |
| Stephenson Excavation LLC | Salmon, ID | Installer | — |
| Tendoy 28 Service LLC | Tendoy, ID | InstallerPumper | — |
| Triple R Backhoe LLC | Teton, ID | Installer | — |
| Underdog Dirt Works | Salmon, ID | Installer | — |
| Warren Landworks LLC | Salmon, ID | Installer | — |
13 companies in the Idaho DEQ permitted subsurface sewage disposal system installers and septic tank pumpers are based in Lemhi County as of 2026-07-23. Companies based elsewhere in Idaho also commonly serve the county.
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