| Company | Location | Certifications | License # |
|---|---|---|---|
| Bass Tim Construction | Madera, CA | Installer (C-42) | 639685 |
| Bass Timothy Inc | Madera, CA | Installer (C-42) | 884137 |
| Biological Technology Inc | Oakhurst, CA | Installer (C-42) | 477941 |
| Black'S Irrigation Systems Inc | Chowchilla, CA | Installer (C-42) | 662410 |
| Egan Tractor Service | Coarsegold, CA | Installer (C-42) | 823847 |
| Goodell Tractor & Septic | Coarsegold, CA | Installer (C-42) | 828048 |
| Hefner'S Inc | Madera, CA | Installer (C-42) | 1029822 |
| Johnson Scott Backhoe Service | Oakhurst, CA | Installer (C-42) | 796454 |
| Oasis F G Drilling | Madera, CA | Installer (C-42) | 1050808 |
| Reed John General Contractor | Oakhurst, CA | Installer (C-42) | 337985 |
| Rohrbaugh Mark L Backhoe Service | North Fork, CA | Installer (C-42) | 572534 |
| Williford Donald A Of California | Wishon, CA | Installer (C-42) | 704621 |
| Zinich Backhoe Service | Coarsegold, CA | Installer (C-42) | 660704 |
13 companies in the CSLB Licensed C-42 Sanitation System Contractors are based in Madera County as of 2026-07-23. Companies based elsewhere in California also commonly serve the county.
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