| Company | Location | Certifications | License # |
|---|---|---|---|
| AC Universal Construction | Garden Valley, ID | Pumper | — |
| Backcountry Dirt Worx | Middleton, ID | Installer | — |
| Compound Construction | Garden Valley, ID | Installer | — |
| Cookson Excavating | Horseshoe Bend, ID | Installer | — |
| Dobson Gravel LLC | Horseshoe Bend, ID | Installer | — |
| Ed Corbett & Co. LLC | Garden Valley, ID | Installer | — |
| Garden Mountain Contractors | Garden Valley, ID | Installer | — |
| Garden Valley Septic | Garden Valley, ID | Pumper | — |
| GS2 Contracting LLC | Horseshoe Bend, ID | Installer | — |
| Inge Industries | Boise, ID | Installer | — |
| Mike Nelson | Garden Valley, ID | Installer | — |
| North Ridge Excavation | Garden Valley, ID | Installer | — |
| One Corner Construction | Horseshoe Bend, ID | Installer | — |
| Paul Shepherd Excavation | Garden Valley, ID | Installer | — |
| Red Dog Corporation | Garden Valley, ID | Installer | — |
| Rocky Mountain Septic LLC | Garden Valley, ID | Pumper | — |
| Ronald Long | Boise, ID | Installer | — |
| Ryno Engineering | Horseshoe Bend, ID | Installer | — |
| Severance Sand and Gravel | Garden Valley, ID | Installer | — |
| Thomas Nelson | Idaho City, ID | Installer | — |
20 companies in the Idaho DEQ permitted subsurface sewage disposal system installers and septic tank pumpers are based in Boise County as of 2026-07-23. Companies based elsewhere in Idaho also commonly serve the county.
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