| Company | Location | Certifications | License # |
|---|---|---|---|
| Able Plumbing Sewer And Drain | San Jose, CA | Installer (C-42) | 1063451 |
| Able Septic | San Jose, CA | Installer (C-42) | 677475 |
| Affordable Underground Co | Morgan Hill, CA | Installer (C-42) | 856953 |
| Amaro Corp | Campbell, CA | Installer (C-42) | 926496 |
| California Plus Engineering Inc | Campbell, CA | Installer (C-42) | 576785 |
| Drain And Water Inc | San Jose, CA | Installer (C-42) | 1026232 |
| Drain Doctor Inc | San Jose, CA | Installer (C-42) | 643458 |
| Drexel Donald A | Los Gatos, CA | Installer (C-42) | 622044 |
| Essential Plumbing Service And Maintenance Inc | San Jose, CA | Installer (C-42) | 1117580 |
| Flow H2o Plumbing Corp | San Jose, CA | Installer (C-42) | 1142030 |
| Fox Onsite Septic Construction | San Jose, CA | Installer (C-42) | 1140002 |
| H & L Construction | San Jose, CA | Installer (C-42) | 1005300 |
| Hawkins Excavating | San Jose, CA | Installer (C-42) | 950668 |
| Hickey W L Sons Inc | San Jose, CA | Installer (C-42) | 95122 |
| Keith Dan Construction | San Martin, CA | Installer (C-42) | 647376 |
| King Kong Plumbing | San Jose, CA | Installer (C-42) | 1088209 |
| Kocher Joe Plumbing Inc | Campbell, CA | Installer (C-42) | 735465 |
| Lewis And Tibbitts Inc | San Jose, CA | Installer (C-42) | 281666 |
| Malley Gregory | Los Altos Hills, CA | Installer (C-42) | 979681 |
| Mana Plumbing | San Jose, CA | Installer (C-42) | 1079848 |
| Mc Donald O C Co Inc | San Jose, CA | Installer (C-42) | 177271 |
| Moeller Mountain Tractor Service | Los Gatos, CA | Installer (C-42) | 545951 |
| Morton Septic Service Inc | Morgan Hill, CA | Installer (C-42) | 804034 |
| One Day Complete Repipe Inc | San Jose, CA | Installer (C-42) | 885692 |
| Platinum Rooter & Plumbing Inc | San Jose, CA | Installer (C-42) | 1074893 |
| Plumbing Tech Inc | San Jose, CA | Installer (C-42) | 933572 |
| Preston Pipelines Inc | Milpitas, CA | Installer (C-42) | 367660 |
| Preston Pipelines Infrastructure Llc | Milpitas, CA | Installer (C-42) | 1059395 |
| Ribbs Plumbing Inc | San Jose, CA | Installer (C-42) | 657845 |
| Sanco Pipelines Incorporated | Los Gatos, CA | Installer (C-42) | 160382 |
| Smart Plumbers & Rooters | Santa Clara, CA | Installer (C-42) | 825685 |
| Smart Plumbers Inc. | Santa Clara, CA | Installer (C-42) | 980701 |
| Trenchfree Inc | San Jose, CA | Installer (C-42) | 971016 |
| Viso James J Engineering Incorporated | Santa Clara, CA | Installer (C-42) | 229798 |
| Whitehorse Grading & Paving Inc | San Jose, CA | Installer (C-42) | 990306 |
35 companies in the CSLB Licensed C-42 Sanitation System Contractors are based in Santa Clara County as of 2026-07-23. Companies based elsewhere in California also commonly serve the county.
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