| Company | Location | Certifications | License # |
|---|---|---|---|
| A+ Waterworks Inc | American Canyon, CA | Installer (C-42) | 745951 |
| Blakeley Construction Inc | Calistoga, CA | Installer (C-42) | 539322 |
| Mr Rooter Plumbing | Napa, CA | Installer (C-42) | 511333 |
| Napa Septic Tank Service Inc | Napa, CA | Installer (C-42) | 254028 |
| P & R Septic Systems Llc | Napa, CA | Installer (C-42) | 482218 |
| Rong'S Backhoe Service | Napa, CA | Installer (C-42) | 629852 |
6 companies in the CSLB Licensed C-42 Sanitation System Contractors are based in Napa County as of 2026-07-23. Companies based elsewhere in California also commonly serve the county.
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