| Company | Location | Certifications | License # |
|---|---|---|---|
| 530 Pipe Flow | Auburn, CA | Installer (C-42) | 1127952 |
| Affordable Septic Installation Inc | Auburn, CA | Installer (C-42) | 1157025 |
| Alpine Earth Moving | Auburn, CA | Installer (C-42) | 883181 |
| Chancellor Dan Backhoe Service | Foresthill, CA | Installer (C-42) | 395901 |
| Davidson Earthworks | Applegate, CA | Installer (C-42) | 1046452 |
| Drone Earthworks | Foresthill, CA | Installer (C-42) | 1110009 |
| Grimes Excavation Inc | Tahoe City, CA | Installer (C-42) | 668041 |
| Harmony Home Improvements Inc | Roseville, CA | Installer (C-42) | 816135 |
| J R Pierce Plumbing Co | Rocklin, CA | Installer (C-42) | 223657 |
| Lamassu Utility Services Inc | Loomis, CA | Installer (C-42) | 1017757 |
| Lw Contracting Inc | Rocklin, CA | Installer (C-42) | 1144244 |
| Martin K P Inc | Auburn, CA | Installer (C-42) | 875144 |
| Robs Sanitation Systems | Roseville, CA | Installer (C-42) | 972468 |
| Schultz Robert Co | Auburn, CA | Installer (C-42) | 700929 |
| Sierra Septic Service & Supply Co | Newcastle, CA | Installer (C-42) | 417533 |
| Superior Plumbing | Rocklin, CA | Installer (C-42) | 771809 |
| Tri-County Pump | Auburn, CA | Installer (C-42) | 545235 |
17 companies in the CSLB Licensed C-42 Sanitation System Contractors are based in Placer County as of 2026-07-23. Companies based elsewhere in California also commonly serve the county.
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