| Company | Location | Certifications | License # |
|---|---|---|---|
| Backcountry Plumbing | Fernwood, ID | Installer | — |
| Barnett Brothers Construction & Excavation LLC | St Maries, ID | Installer | — |
| Black Diamond Excavating LLC | Plummer, ID | Installer | — |
| Boroff Construction LLC | Tensed, ID | Installer | — |
| Carbaugh Contracting Inc. | Fernwood, ID | Installer | — |
| Cash Nicolson D&S Grading and Excavation | St Maries, ID | Installer | — |
| CJR Construction LLC | St Maries, ID | Installer | — |
| Crane Backhoe & Trucking | St Maries, ID | Installer | — |
| Dodson Dirty Works | Fernwood, ID | Installer | — |
| Earthcrafters Dirtworks LLC | Worley, ID | Installer | — |
| Harp Construction | St Maries, ID | Installer | — |
| Hilltop Excavation LLC | St Maries, ID | Installer | — |
| Idaho Earthworks LLC | Plummer, ID | Installer | — |
| Interstate Drilling & Pump LLC | St Maries, ID | Installer | — |
| Jeff Ritchie | St Maries, ID | Installer | — |
| K Bales Enterprises | Plummer, ID | Installer | — |
| KH Excavating | St Maries, ID | Installer | — |
| LJ Sewer and Water LLC | Worley, ID | Installer | — |
| Mitchell Excavation Inc. | Fernwood, ID | Installer | — |
| Northwest Porta Potties | St Maries, ID | Pumper | — |
| Pinsk | Plummer, ID | Installer | — |
| Pioneer Excavating LLC | St Maries, ID | Installer | — |
| Pugh Brothers Construction | St Maries, ID | Installer | — |
| St Joe Potty Huts | St Maries, ID | Pumper | — |
| St Maries Septic Service | St Maries, ID | Pumper | — |
| WD Dirty Works | Plummer, ID | Installer | — |
26 companies in the Idaho DEQ permitted subsurface sewage disposal system installers and septic tank pumpers are based in Benewah County as of 2026-07-23. Companies based elsewhere in Idaho also commonly serve the county.
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