| Company | Location | Certifications | License # |
|---|---|---|---|
| A-1 Septic Tank Service | Littleriver, CA | Installer (C-42) | 838308 |
| Crosetti Excavation, Inc | Ukiah, CA | Installer (C-42) | 1150162 |
| Farley Robert Allen | Gualala, CA | Installer (C-42) | 912007 |
| Howard Lee Construction Company | Ukiah, CA | Installer (C-42) | 280777 |
| J A Construction | Littleriver, CA | Installer (C-42) | 1049847 |
| Plumbline Services Inc | Talmage, CA | Installer (C-42) | 403423 |
| Sundstrom Matthew Construction | Gualala, CA | Installer (C-42) | 1025975 |
| Watkins Sand & Gravel | Fort Bragg, CA | Installer (C-42) | 871266 |
8 companies in the CSLB Licensed C-42 Sanitation System Contractors are based in Mendocino County as of 2026-07-23. Companies based elsewhere in California also commonly serve the county.
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