| Company | Location | Certifications | License # |
|---|---|---|---|
| Academy Mechanical Inc | Laguna Woods, CA | Installer (C-42) | 457040 |
| American Contractors Inc | Orange, CA | Installer (C-42) | 309863 |
| C - 42 Systems | Yorba Linda, CA | Installer (C-42) | 515333 |
| Cec Construction Engineering | Huntington Beach, CA | Installer (C-42) | 1095384 |
| Clean Out Plumbing And Rooter | La Habra, CA | Installer (C-42) | 1017551 |
| Dymek'S Freedom Plumbing Inc | Placentia, CA | Installer (C-42) | 764483 |
| Empire Pipe Cleaning And Equipment Inc | Orange, CA | Installer (C-42) | 363528 |
| Empire Plumbing Heating & A/C | Huntington Beach, CA | Installer (C-42) | 652877 |
| Empire Plumbing Heating & Air Conditioning | Huntington Beach, CA | Installer (C-42) | 794154 |
| Four Star Plumbing | San Clemente, CA | Installer (C-42) | 692628 |
| Franklin Development Co | Anaheim, CA | Installer (C-42) | 747049 |
| G G Garcia Plumbing Pumping & Rooter Inc | Orange, CA | Installer (C-42) | 961596 |
| Garcia G G Plumbing Pumping & Rooter | Orange, CA | Installer (C-42) | 656539 |
| H P L Mechanical Inc | Santa Ana, CA | Installer (C-42) | 308208 |
| Hacienda Pipeline Company Inc | Yorba Linda, CA | Installer (C-42) | 818685 |
| Hercon Company Inc | Rancho Santa Margarita, CA | Installer (C-42) | 603928 |
| Hogan Plumbing | San Clemente, CA | Installer (C-42) | 138350 |
| Hood Pacific Contractors Inc | Tustin, CA | Installer (C-42) | 939862 |
| Janis John Plumbing | Costa Mesa, CA | Installer (C-42) | 760476 |
| Jimni Systems Inc | Irvine, CA | Installer (C-42) | 591989 |
| Kabo Equipment Inc | Costa Mesa, CA | Installer (C-42) | 835921 |
| Kahuna Comfort Plumbing Heating & Air | Anaheim, CA | Installer (C-42) | 1040076 |
| Martin Sanitation | Mission Viejo, CA | Installer (C-42) | 855559 |
| Mr Rocco'S Plumbing | Anaheim, CA | Installer (C-42) | 1003303 |
| Mr Rooter Plumbing | Anaheim, CA | Installer (C-42) | 767047 |
| Murray Company | Cypress, CA | Installer (C-42) | 162382 |
| Noriega Guillermo O | Orange, CA | Installer (C-42) | 674813 |
| Orange County Plumbing Inc | Santa Ana, CA | Installer (C-42) | 852953 |
| Orange County Pumping Inc | Santa Ana, CA | Installer (C-42) | 680703 |
| Pacific Plumbing Company Of Santa Ana | Santa Ana, CA | Installer (C-42) | 266807 |
| Pan-Pacific Mechanical Llc | Fountain Valley, CA | Installer (C-42) | 1006709 |
| Plumbing Solution Specialist | Anaheim, CA | Installer (C-42) | 929609 |
| R M Mechanical A Joint Venture | Cypress, CA | Installer (C-42) | 1060431 |
| Right Angle Solutions Inc | Anaheim, CA | Installer (C-42) | 946386 |
| Rooter Man Oc Inc | Orange, CA | Installer (C-42) | 1089047 |
| Sanitation Systems | Huntington Beach, CA | Installer (C-42) | 825824 |
| Three Rivers Sanitation Services | Irvine, CA | Installer (C-42) | 1150537 |
| William Worthey Iii | Los Alamitos, CA | Installer (C-42) | 1027856 |
38 companies in the CSLB Licensed C-42 Sanitation System Contractors are based in Orange County as of 2026-07-23. Companies based elsewhere in California also commonly serve the county.
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