| Company | Location | Certifications | License # |
|---|---|---|---|
| 2 Rivers Excavation LLC | Kamiah, ID | Installer | — |
| Dennis R. Bishop | Kamiah, ID | Installer | — |
| Rock Creek Equipment | Kamiah, ID | Installer | — |
| Twin Rivers Remodeling | Kamiah, ID | Installer | — |
4 companies in the Idaho DEQ permitted subsurface sewage disposal system installers and septic tank pumpers are based in Lewis County as of 2026-07-23. Companies based elsewhere in Idaho also commonly serve the county.
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