| Company | Location | Certifications | License # |
|---|---|---|---|
| 3B General Contracting | Juliaetta, ID | Installer | — |
| Aligned Excavation & Construction LLC | Deary, ID | Installer | — |
| Daniel John Ross | Moscow, ID | Installer | — |
| Forged Excavation LLC | Moscow, ID | Installer | — |
| Halvorson Excavation LLC | Troy, ID | Installer | — |
| Hatter Creek Earth Works, LLC | Princeton, ID | Installer | — |
| Legacy Contractors LLC | Deary, ID | Installer | — |
| Lustig General Contracting LLC | Kendrick, ID | Installer | — |
| Palouse Valley Septic Service-installer | Potlatch, ID | Installer | — |
| Pauls Power Shovel | Harvard, ID | Installer | — |
| Quality Contractors, LLC | Deary, ID | Installer | — |
| Roach Construction Company | Genesee, ID | Installer | — |
| Schiemers Excavation LLC | Kendrick, ID | Installer | — |
| Selway Construction Group | Moscow, ID | Installer | — |
| Skyline Landworks | Viola, ID | Installer | — |
| Taylors Construction | Juliaetta, ID | Installer | — |
| Three Bear Contracting LLC | Kendrick, ID | Installer | — |
| Van Houten Construction LLC | Troy, ID | Installer | — |
| Wilcox Ranch LLC | Deary, ID | Installer | — |
| Youmans Excavation Service LLC | Moscow, ID | Installer | — |
20 companies in the Idaho DEQ permitted subsurface sewage disposal system installers and septic tank pumpers are based in Latah County as of 2026-07-23. Companies based elsewhere in Idaho also commonly serve the county.
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