| J M B Plumbing & Construction Inc | C36 + B | 1994 | Active |
| J T Plumbing | C36 | 1992 | Active |
| Jahn Builders | C36 + B, C10 | 1996 | Active |
| Jetpipe Plumbing LLC | C36 | 2025 | Active |
| JJ Plumbing & Sewer Inc | C36 | 2026 | Active |
| JM Water Heaters & Drains LLC | C36 | 2022 | Active |
| JV Plumbing & Sewer Services Inc | C36 | 2024 | Active |
| KDS Plumbing Inc | C36 | 1994 | Active |
| King Kong Plumbing | C36 + A, C42 | 2022 | Active |
| Kingdom Plumbing Inc | C36 | 2023 | Active |
| Knockout Plumbing & Repipe Inc | C36 | 2022 | Active |
| Knowles Pipeworks And Plumbing Corp | C36 | 2023 | Active |
| KPN Builders Inc | C36 + B, C10 | 2021 | Active |
| Lane Greg Plumbing Inc | C36 | 1991 | Active |
| Leader Design & Construction Corp | C36 + B, C10, C20 | 2011 | Active |
| Legacy Plumbing & Rooter Inc | C36 | 2021 | Active |
| Lewis And Tibbitts Inc | C36 + A, C10, C42 | 1973 | Active |
| Local Rooter Corp | C36 | 2023 | Active |
| LP Builders Inc | C36 + B, C10 | 2020 | Active |
| Lucky Rooter & Plumbing | C36 | 2019 | Active |
| Lyons Brothers Plumbing | C36 | 1988 | Active |
| MC Donald O C Co Inc | C36 + A, B, C4 +3 | 1958 | Active |
| Mike Counsil Plumbing LLC | C36 | 1993 | Active |
| Montoya Mechanical Inc | C36 | 2001 | Renew by Dec 31, 2026 |
| Moomau Plumbing Inc | C36 | 2001 | Active |
| Moor Plumbing Solutions Inc | C36 | 2022 | Renew by Dec 31, 2026 |
| Mr Ra's Plumbing Inc | C36 | 2013 | Active |
| Mr Reliable Plumbing & Heating | C36 + C20 | 2016 | Active |
| Mueller Plumbing Inc | C36 | 1991 | Active |
| N T Bay Area Construction Inc | C36 + B, C20 | 2018 | Active |
| New Construction | C36 + B, C10 | 2023 | Active |
| New Life Plumbing Inc | C36 | 1987 | Active |
| Nextgen Plumbing Inc | C36 | 2019 | Active |
| Nic Plumbing Co | C36 + B | 2016 | Active |
| Noah's Plumbing Inc | C36 | 2013 | Active |
| Norcal Bay Construction Inc | C36 + B, C20 | 2019 | Active |
| NRP Plumbing Inc | C36 | 2026 | Active |
| One Day Complete Repipe Inc | C36 + B, C42 | 2006 | Active |
| Owen Plumbing And General Contracting Inc | C36 + B | 1971 | Active |
| Ozzy Construction Inc | C36 + B, C5, C10 | 2013 | Active |
| Pacific Coast Home Services | C36 + B, C10, C20 +1 | 2005 | Active |
| Pappas Piping Service Inc | C36 | 2005 | Active |
| Pinnacle Precision Plumbing Inc | C36 | 2001 | Active |
| Pipe-Thru Plumbing Inc | C36 | 2018 | Active |
| Platinum Rooter & Plumbing Inc | C36 + A, C42 | 2021 | Active |
| Plumb One Plumbing Company | C36 | 1989 | Active |
| Plumb Perfect Inc | C36 | 1991 | Active |
| Plumbear Inc | C36 | 2025 | Active |
| Plumbing Company And Rooter Inc The | C36 | 2024 | Active |
| Plumbing Solution Inc | C36 | 2024 | Renew by Dec 31, 2026 |
| Plumbing Tech Inc | C36 + C42 | 2009 | Active |
| Plumbing Tech Repipe Specialists Inc | C36 | 2016 | Active |
| Plumbing Titans LLC | C36 | 2026 | Active |
| Plus Plumbing Inc A | C36 + B | 2002 | Active |
| Prestige Plumbing Bay Area Inc | C36 | 2018 | Renew by Nov 30, 2026 |
| Proper Hour Home Service Inc | C36 + B | 2025 | Active |
| Pros Plumbing & Rooter | C36 | 2010 | Active |
| Pure Pipe Plumbing Inc | C36 | 2025 | Active |
| Pure Tech Plumbing Inc | C36 | 2013 | Active |
| Qualtech Mechanical Inc | C36 + B, C20 | 2016 | Renew by Dec 31, 2026 |
| R P S Plumbing Inc | C36 | 2019 | Active |
| Rapid Bath & Showers | C36 | 2005 | Active |
| RB Plumbing Services Inc | C36 | 2024 | Active |
| RCK Build Inc | C36 + B, C10 | 2025 | Active |
| Redwood Pacific Plumbing LLC | C36 | 2020 | Active |
| RG Plumbing & Repiping Inc | C36 | 2026 | Active |
| Ribbs Plumbing Inc | C36 + C42 | 1992 | Active |
| Rocky Mountain Plumbing Inc | C36 | 2026 | Active |
| Royal Plumbing & Sewer Service Inc | C36 + C16 | 2007 | Active |
| RPS Ribbs Plumbing And Sewer | C36 + C33 | 2017 | Active |
| Ruiz Pro Plumbing | C36 | 2026 | Active |
| S & S Tile Inc | C36 + B, C54 | 1988 | Active |
| Saenz Plumbing Inc | C36 | 2026 | Active |
| San Jose Plumbing Inc | C36 | 1991 | Active |
| Sas Plumbing Inc | C36 | 2018 | Active |
| Sav Water Heaters And Plumbing | C36 + C10, C20 | 2023 | Active |
| Seton Pacific Company | C36 + B, C10, C16 +1 | 2010 | Active |
| Seven Trees Plumbing Inc | C36 | 2022 | Active |
| Shark Plumbing Services | C36 | 2022 | Active |
| Signature Plumbing | C36 | 2019 | Active |
| Silicon Pro Service Plumbing | C36 | 2022 | Active |
| Silicon Valley Mechanical Inc | C36 + C4, C20 | 2014 | Active |
| Simply Green Plumbing Inc | C36 | 2010 | Active |
| Spindola Construction | C36 + B | 2005 | Active |
| SPS Plumbing LLC | C36 | 2010 | Active |
| Square Three Inc | C36 + B, C10, C16 +2 | 2021 | Active |
| Street Plumbing & Rooter LLC | C36 | 2022 | Active |
| Sunny Ca International Inc | C36 + B, C10 | 2021 | Active |
| Superior Plumbing LLC | C36 | 2004 | Active |
| Supreme Rooter & Plumbing Inc | C36 | 2024 | Active |
| SV Plumbing Inc | C36 | 2021 | Active |
| Swags Plumbing And Rooter Inc | C36 | 2019 | Active |
| T & D Plumbing Corp | C36 | 2026 | Active |
| T T Construction Inc | C36 + B, C10, C20 | 2019 | Active |
| Terry Mechanical Inc | C36 | 1990 | Active |
| The Rooter Service Inc | C36 | 1999 | Active |
| The Water Pros Inc | C36 | 2023 | Active |
| Therma LLC | C36 + A, B, C4 +4 | 2017 | Active |
| Top Mark Plumbing Inc | C36 | 2025 | Active |
| Trenchfree Inc | C36 + A, C10, C12 +1 | 2012 | Active |