| Company | Location | Certifications | License # |
|---|---|---|---|
| A-1 Bay Area Rooter & Plumbing | Oakland, CA | Installer (C-42) | 1116691 |
| A-1 Septic Tank Service Inc | Hayward, CA | Installer (C-42) | 438710 |
| Aaa Plumbing & Remodeling Inc | Castro Valley, CA | Installer (C-42) | 1052769 |
| Above All Plumbing Inc | Newark, CA | Installer (C-42) | 739199 |
| Ace Sewer Lateral Contractor | Hayward, CA | Installer (C-42) | 994389 |
| Albert Nahman Plumbing Heating And Cooling | Alameda, CA | Installer (C-42) | 1083634 |
| Albion Plumbing & Rooter Inc | San Leandro, CA | Installer (C-42) | 899622 |
| Amigo Rooter & Plumbing | Livermore, CA | Installer (C-42) | 917521 |
| Aqua Stat Plumbing Inc | Hayward, CA | Installer (C-42) | 1042922 |
| Bayvalley Mechanical Inc | Union City, CA | Installer (C-42) | 1072787 |
| Berkeley Plumbing & Heating Company Inc | Berkeley, CA | Installer (C-42) | 293715 |
| Bonetti Frank Plumbing Inc | Castro Valley, CA | Installer (C-42) | 251165 |
| Broadway Mechanical - Contractors Inc | Oakland, CA | Installer (C-42) | 584263 |
| Capelli Plumbing Inc | San Leandro, CA | Installer (C-42) | 1026755 |
| Carrillo J Plumbing And Drains | Hayward, CA | Installer (C-42) | 938525 |
| Central Plumbing & Sewers | Alameda, CA | Installer (C-42) | 964557 |
| Challenge Rooter | Oakland, CA | Installer (C-42) | 1008865 |
| Chico Trenchless Co | Hayward, CA | Installer (C-42) | 817696 |
| Clark Harry Plumbing And Heating Inc | Oakland, CA | Installer (C-42) | 792463 |
| Cutter Sewer And Sanitation Systems | Oakland, CA | Installer (C-42) | 1042487 |
| Desilva Gates - Ghilotti A Joint Venture | Dublin, CA | Installer (C-42) | 1125855 |
| East Bay Sewer Inc | Oakland, CA | Installer (C-42) | 1135344 |
| Eco Sewers & Drains Plumbing | Oakland, CA | Installer (C-42) | 1009599 |
| Economy Rooter & Plumbing Inc | Oakland, CA | Installer (C-42) | 1039625 |
| Ehret Co Plumbing | Oakland, CA | Installer (C-42) | 834005 |
| Elden Plumbing Inc | Oakland, CA | Installer (C-42) | 1015348 |
| Emergency Rooter | Oakland, CA | Installer (C-42) | 729165 |
| Excalibur Rooter And Plumbing Inc | Hayward, CA | Installer (C-42) | 1072119 |
| Finch Plumbing & Sewer | San Leandro, CA | Installer (C-42) | 1148938 |
| Ha Hien | Oakland, CA | Installer (C-42) | 963171 |
| Hayward Plumbing & Rooter | Hayward, CA | Installer (C-42) | 1083284 |
| J J Rooter & Plumbing | Berkeley, CA | Installer (C-42) | 1044243 |
| Jc Green Plumbing Inc | San Leandro, CA | Installer (C-42) | 960969 |
| Knox Sewer And Backhoe Service Inc | Oakland, CA | Installer (C-42) | 659212 |
| Larrieta Sanitation Construction | Oakland, CA | Installer (C-42) | 1007540 |
| Lio Rooter Company | Oakland, CA | Installer (C-42) | 1090286 |
| Marina Plumbing Company | Pleasanton, CA | Installer (C-42) | 462864 |
| Mg Rooter Inc | Oakland, CA | Installer (C-42) | 1146516 |
| Michael Gardner Plumbing | San Lorenzo, CA | Installer (C-42) | 1087221 |
| Monarch Plumbing And Rooter Inc | Hayward, CA | Installer (C-42) | 1014475 |
| Monterey Mechanical Co | Oakland, CA | Installer (C-42) | 388361 |
| Mr Rooter Plumbing | Oakland, CA | Installer (C-42) | 453536 |
| Nexgen Rooter And Plumbing Inc | San Lorenzo, CA | Installer (C-42) | 1083613 |
| Ortiz Plumbing Drain Cleaning | Livermore, CA | Installer (C-42) | 1053855 |
| Owen | Castro Valley, CA | Installer (C-42) | 395410 |
| P J Plumbing Inc | Oakland, CA | Installer (C-42) | 992574 |
| Pacific Plumbing Systems Inc | San Leandro, CA | Installer (C-42) | 909639 |
| Paso Robles Plumbing Heating And Air | Alameda, CA | Installer (C-42) | 1099384 |
| Pelican Plumbers | Berkeley, CA | Installer (C-42) | 872437 |
| Pierce J R Plumbing Company | San Leandro, CA | Installer (C-42) | 188225 |
| Pipe Rooter | Hayward, CA | Installer (C-42) | 1106051 |
| Plumbing Connection | Union City, CA | Installer (C-42) | 944509 |
| Plumbing Guy & Trenchless | Hayward, CA | Installer (C-42) | 1101986 |
| Plumbing Prodigy | Hayward, CA | Installer (C-42) | 1108004 |
| Precision Plumbing | Fremont, CA | Installer (C-42) | 917303 |
| Precision Sewers | Oakland, CA | Installer (C-42) | 707251 |
| Pristine Plumbing & Rooter | Oakland, CA | Installer (C-42) | 1035587 |
| Pro Rooter Inc | San Leandro, CA | Installer (C-42) | 636652 |
| Qualified Plumbers Services Inc | Union City, CA | Installer (C-42) | 884105 |
| Rays Service One Plumbing | Oakland, CA | Installer (C-42) | 1022293 |
| Rooter Solutions Of California Inc | Oakland, CA | Installer (C-42) | 1045663 |
| Rp Sanitation Systems | Oakland, CA | Installer (C-42) | 1154299 |
| Service Rescue Inc | Fremont, CA | Installer (C-42) | 1082095 |
| Sims J L Plumbing Contractors | Berkeley, CA | Installer (C-42) | 369874 |
| Star Rooter & Plumbing | San Lorenzo, CA | Installer (C-42) | 845187 |
| Star Rooter And Plumbing Inc | San Lorenzo, CA | Installer (C-42) | 884481 |
| Streamline Plumbing & Drain Co | Castro Valley, CA | Installer (C-42) | 672250 |
| T A R C Construction Inc | Fremont, CA | Installer (C-42) | 853583 |
| Tap - Tite Company | San Lorenzo, CA | Installer (C-42) | 786502 |
| The Plumbing Ministry | San Leandro, CA | Installer (C-42) | 894946 |
| Toto'S Plumbing Inc | Oakland, CA | Installer (C-42) | 1001580 |
| Trinity Liquid Waste Services | Pleasanton, CA | Installer (C-42) | 1125983 |
| Underground Rooter | Oakland, CA | Installer (C-42) | 1076659 |
| Warriors Plumbing | Oakland, CA | Installer (C-42) | 1040009 |
| Wighton'S Electric Plumbing Heating & Air Conditioning | Alameda, CA | Installer (C-42) | 1083949 |
| Williams Underground Construction Inc | Oakland, CA | Installer (C-42) | 787857 |
76 companies in the CSLB Licensed C-42 Sanitation System Contractors are based in Alameda County as of 2026-07-23. Companies based elsewhere in California also commonly serve the county.
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