| Company | Location | Certifications | License # |
|---|---|---|---|
| Aaron Plumbing | Vacaville, CA | Installer (C-42) | 352544 |
| Benicia Plumbing Inc | Benicia, CA | Installer (C-42) | 329632 |
| Betos Plumbing And Rooter | Vallejo, CA | Installer (C-42) | 1106201 |
| C Y A Septic | Fairfield, CA | Installer (C-42) | 1104603 |
| Cm Plumbing Inc | Vallejo, CA | Installer (C-42) | 923674 |
| Delatorre Septic And Trucking Llc | Vacaville, CA | Installer (C-42) | 1070098 |
| Frank'S Septic Service Inc | Vacaville, CA | Installer (C-42) | 563728 |
| Ns Sewer Piping Inc | Vallejo, CA | Installer (C-42) | 1100248 |
| Plumbing Solutions | Fairfield, CA | Installer (C-42) | 871320 |
| Silvermark Construction Services Inc | Fairfield, CA | Installer (C-42) | 1019403 |
| Trench Less Solutions | Fairfield, CA | Installer (C-42) | 1053450 |
11 companies in the CSLB Licensed C-42 Sanitation System Contractors are based in Solano County as of 2026-07-23. Companies based elsewhere in California also commonly serve the county.
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