| Company | Location | Certifications | License # |
|---|---|---|---|
| A-Jay Excavating Inc | Atascadero, CA | Installer (C-42) | 456026 |
| Al'S Septic Pumping Service Inc | Los Osos, CA | Installer (C-42) | 883281 |
| Alliance Septic | Paso Robles, CA | Installer (C-42) | 1009043 |
| Dallaire John Excavating | Atascadero, CA | Installer (C-42) | 500085 |
| Kies Construction And Excavating | Arroyo Grande, CA | Installer (C-42) | 770692 |
| Merrill Frank Backhoe Services | Los Osos, CA | Installer (C-42) | 337347 |
| Muniz Excavating Inc | Paso Robles, CA | Installer (C-42) | 951129 |
| North County Septic Service Inc | Paso Robles, CA | Installer (C-42) | 983162 |
| Sims Excavating | Nipomo, CA | Installer (C-42) | 887926 |
| Story'S Construction | Los Osos, CA | Installer (C-42) | 870176 |
| Tierra Construction | Grover Beach, CA | Installer (C-42) | 765689 |
| Tutt Tree Crane And Service | Los Osos, CA | Installer (C-42) | 606137 |
| Valentine'S Backhoe Service | Templeton, CA | Installer (C-42) | 351033 |
13 companies in the CSLB Licensed C-42 Sanitation System Contractors are based in San Luis Obispo County as of 2026-07-23. Companies based elsewhere in California also commonly serve the county.
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