| Company | Location | Certifications | License # |
|---|---|---|---|
| A. Williams & Son, LLC | Grangeville, ID | Installer | — |
| Arnzen Brothers LLC | Cottonwood, ID | Installer | — |
| Arnzen Building Construction Inc. | Cottonwood, ID | Installer | — |
| Cook& Sons Construction, LLC. | Grangeville, ID | Installer | — |
| Eynon Construction InC. | Grangeville, ID | Installer | — |
| Gateway Construction | Riggins, ID | Installer | — |
| Graham Construction | Stites, ID | Installer | — |
| Groundwork Excavation | Grangeville, ID | Installer | — |
| Hollibaugh Equipment Services LLC | Grangeville, ID | Installer | — |
| Idaho Excavating | Grangeville, ID | Installer | — |
| J&S Excavating | Kooskia, ID | Installer | — |
| Kern Construction, InC. | Riggins, ID | Installer | — |
| Mountain Construction Inc. | Cottonwood, ID | Installer | — |
| Prodigal Services LLC | Cottonwood, ID | Installer | — |
| Rehder Excavation LLC | Cottonwood, ID | Installer | — |
| Sickels Excavation | Grangeville, ID | Installer | — |
| Solid Ground Resources | Grangeville, ID | Installer | — |
| SRS Construction | Riggins, ID | Installer | — |
| TKT Excavation and Trucking | Kooskia, ID | Installer | — |
| Wishful Thinking Ent. | White Bird, ID | Installer | — |
20 companies in the Idaho DEQ permitted subsurface sewage disposal system installers and septic tank pumpers are based in Idaho County as of 2026-07-23. Companies based elsewhere in Idaho also commonly serve the county.
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