| $15 Sewer And Drain Service | C36 | 1986 | Active |
| 1 Hour Drain Hotshot Restoration | C36 + B, C20, C43 +1 | 2010 | Active |
| A & D Plumbing Services | C36 | 2026 | Active |
| A B Castro Plumbing Inc | C36 + C27 | 2005 | Active |
| A Plus Commercial Services | C36 + B, C20 | 2005 | Active |
| Abarcas Repipe & Plumbing Inc | C36 | 2024 | Active |
| Able Plumbing Sewer And Drain | C36 + A, C34, C42 | 2020 | Active |
| Air Systems Inc | C36 + C10, C20, C43 +1 | 2005 | Active |
| Alb Construction | C36 + B, C10, C20 | 2025 | Active |
| Alert Plumbing Inc | C36 | 2005 | Active |
| Aligned Developers | C36 + B | 2017 | Active |
| Allstar Plumbing Corporation | C36 | 1997 | Active |
| Almaden Valley Plumbing Inc | C36 | 2018 | Active |
| Alpha Omega Plumbing Inc | C36 | 1999 | Active |
| Alpha Plumbing | C36 | 1998 | Active |
| American Beverage Equipment Inc | C36 + C38 | 1994 | Active |
| American Builder & Electrical Inc | C36 + A, B, C10 +1 | 2021 | Active |
| An Builder Inc | C36 + B, C10 | 2025 | Active |
| Antonio Mora Plumbing Inc | C36 | 2008 | Active |
| Aqualine Piping Inc | C36 | 2011 | Active |
| Aquatek Plumbing Inc | C36 | 1993 | Active |
| Arroyo Plumbing And Drain Inc | C36 | 2009 | Active |
| Atrics Inc | C36 + B, C15, C17 +2 | 2010 | Active |
| Ats Mechanical | C36 + B, C4, C20 +1 | 1984 | Active |
| Axis Mechanical Inc | C36 + C20 | 2012 | Active |
| Ay Emp Inc | C36 + B, C10, C20 | 2021 | Active |
| B Green Construction Inc | C36 + B | 2011 | Active |
| Bay 360 Construction Inc | C36 + B, C10 | 2024 | Active |
| Bay Pro Plumbing Inc | C36 | 2022 | Renew by Oct 31, 2026 |
| Bayk Plumbing Inc | C36 | 2026 | Active |
| Bayline Plumbing Inc | C36 | 1995 | Active |
| Best Quality Plumbers Inc | C36 | 2015 | Active |
| Better Water Heaters Inc | C36 | 2019 | Active |
| Beyond Electric LLC | C36 + C10 | 2025 | Active |
| Bigg Tree Rooter Plumbing | C36 | 2020 | Active |
| Blackwood Construction Co | C36 + B, C10 | 2026 | Active |
| Blossom Valley Plumbing Inc | C36 | 2000 | Active |
| Blue Diamond Plumbing Inc | C36 | 1998 | Active |
| Brajan Construction Inc | C36 + B | 2012 | Active |
| Bravo's Plumbing Inc | C36 | 2018 | Active |
| Bridgeview Construction Inc | C36 + B | 2020 | Renew by Oct 31, 2026 |
| Bukazoo Inc | C36 + B, C20 | 2015 | Active |
| Burr Plumbing And Pumping Inc | C36 + A, C10, D21 | 1996 | Active |
| C & E Plumbing & Sewer Service Inc | C36 | 2019 | Active |
| California Plumbing David Inc | C36 | 2018 | Active |
| Castro Plumbing | C36 | 1994 | Active |
| Champion Plumbing Pro Inc | C36 | 1999 | Active |
| Charley's Plumbing Services Inc | C36 | 2018 | Active |
| CHL Plumbing Inc | C36 | 2017 | Active |
| Ciari Stephen Plumbing And Heating Inc | C36 + C4, C20 | 2003 | Active |
| Cima Builders Group Inc | C36 + B, C27 | 2007 | Active |
| Ciria's Plumbing Inc | C36 | 2026 | Active |
| Clean Tech Builders | C36 + B, C10, C20 | 2016 | Active |
| Core Plumbing Solutions Inc | C36 | 2025 | Active |
| Counsil Plumbing | C36 | 2008 | Renew by Nov 30, 2026 |
| Cpi Service | C36 + A, C20 | 2023 | Active |
| Critchfield Mechanical Inc | C36 + C4, C20 | 1977 | Active |
| Demi Plumbing Inc | C36 | 2010 | Active |
| Drain & Plumbing Solutions LLC | C36 | 2021 | Active |
| Drain And Water Inc | C36 + C12, C42 | 2017 | Active |
| Drain Doctor Inc | C36 + B, C10, C33 +1 | 1992 | Active |
| Dti Construction Inc | C36 + B | 2026 | Active |
| E Rivas Plumbing Inc | C36 | 2020 | Active |
| Efficient Water Heaters Inc | C36 | 2015 | Active |
| Epicimpression Builders Inc | C36 + B, C10 | 2024 | Active |
| Essential Plumbing Service And Maintenance Inc | C36 + C4, C16, C20 +1 | 2024 | Active |
| Euro Climate Inc | C36 + C20 | 2012 | Active |
| Eze Plumbing LLC | C36 | 2025 | Active |
| First Evergreen Plumbing Inc | C36 | 2012 | Active |
| FK Remodeling Inc | C36 + B2 | 2025 | Active |
| Flo-Rite Plumbing LLC | C36 | 2026 | Active |
| Flow H2o Plumbing Corp | C36 + C42 | 2025 | Active |
| Fluid Dynamics Plumbing Inc | C36 | 2025 | Active |
| Foothill Plumbing | C36 | 1989 | Active |
| Four Seasons Construction | C36 + B, C10, C27 | 2024 | Active |
| Freedom Underground Plumbing Inc | C36 + A | 2014 | Active |
| G A & J Plumbing | C36 | 2017 | Active |
| Genmor Plumbing Inc | C36 + B | 2004 | Active |
| Georges Plumbing Service Inc | C36 | 2022 | Active |
| GG Pro Plumbing | C36 | 2026 | Active |
| Giant Plumbing Inc | C36 | 1992 | Active |
| Gladiator Repipe Inc | C36 | 2015 | Active |
| GLD Green Energy | C36 + B, C10, C20 | 2006 | Active |
| Gogo Rooter | C36 | 2009 | Active |
| Gold Star Plumbing | C36 | 2023 | Active |
| Golden State Plumbing Sewer And Drain Inc | C36 | 2015 | Active |
| Golds Plumbing Inc | C36 | 2023 | Active |
| GPM Plumbing LLC | C36 | 2025 | Active |
| Grade A Plumbing Services Inc | C36 | 2011 | Active |
| Hickey W L Sons Inc | C36 + C4, C16, C20 +1 | 1947 | Active |
| Hightop Plumbing LLC | C36 | 2022 | Active |
| Homeguard Incorporated | C36 + B, C39 | 1996 | Renew by Nov 30, 2026 |
| Huerta's Plumbing Inc | C36 | 2018 | Active |
| Hylton Plumbing Inc | C36 | 1973 | Active |
| I D C Engineering | C36 + A, C10, C20 +2 | 1998 | Active |
| Icom Mechanical Inc | C36 + B, C20 | 1981 | Active |
| Industrial Piping Systems Inc | C36 | 1986 | Active |
| Innovation Plumbing Inc | C36 | 2021 | Active |
| Interstate Decisive Contractor-I D C | C36 + A, B, C10 +5 | 1982 | Active |
| Irbis Air Plumbing Electrical | C36 + C10, C20 | 2018 | Active |