| 8a Construction | C36 | 2019 | Active |
| A G I Plumbing Solutions Inc | C36 | 2016 | Renew by Nov 30, 2026 |
| A3 Plumbing Inc | C36 | 2026 | Active |
| Adavco Inc | C36 | 1983 | Active |
| Advanced Plumbing Service | C36 | 1992 | Active |
| All About The Business Septic Services | C36 | 2019 | Active |
| All Climate Air Inc | C36 | 2005 | Active |
| Alliance Construction Services | C36 | 2026 | Active |
| American Mechanical Systems Ca | C36 | 2021 | Active |
| Aquaguard Technologies LLC | C36 | 2026 | Active |
| Archuleta Plumbing Inc | C36 | 2024 | Active |
| Asp Plumbing Inc | C36 | 2005 | Active |
| Backyard And Home Construction | C36 | 2020 | Active |
| Bakersfield Plumbing Co Inc | C36 | 1979 | Active |
| Bakersfield Quality Plumbing | C36 | 2020 | Active |
| Bics George A Plumbing Inc | C36 | 1968 | Active |
| Big Boss Plumbing Inc The | C36 | 2024 | Active |
| Big Time Plumbing Inc | C36 | 2023 | Active |
| Binns J Noble Plumbing Company Inc | C36 | 1985 | Active |
| Black Sheep Pools | C36 | 2022 | Active |
| Building America Plumbing Inc | C36 | 2024 | Active |
| California Plumbing Solutions Corporation | C36 | 2026 | Active |
| Callahan Pat Ceramic Tile | C36 | 1982 | Active |
| Can Do Crew Plumbing Heating & AC | C36 | 2010 | Active |
| Can Do Crew Staffing Inc | C36 | 2025 | Active |
| Capital Management Inc | C36 | 2026 | Active |
| Central Valley Plumbing & Mechanical Inc | C36 | 2007 | Active |
| Clog Monkey Corp | C36 | 2023 | Active |
| Clover Plumbing LLC | C36 | 2020 | Active |
| CN Plumbing Inc | C36 | 2020 | Active |
| CNF Plumbing | C36 | 2023 | Active |
| Co-Opp Plumbing | C36 | 2002 | Active |
| Community Outreach Services | C36 | 2018 | Active |
| Day And Night Plumbing Solutions Inc | C36 | 2026 | Active |
| Drain Pro Rooter & Septic Inc | C36 | 2005 | Active |
| Family First Heating & Air Conditioning | C36 | 2024 | Active |
| Forward Bound Plumbing | C36 | 2010 | Renew by Nov 30, 2026 |
| Freedom Remodeling Inc | C36 | 2024 | Active |
| Frontier Plumbing | C36 | 2016 | Active |
| G R C Plumbing | C36 | 2008 | Active |
| Garrett's Plumbing Company Inc | C36 | 2006 | Active |
| Gill & Sons Enterprises Inc | C36 | 2022 | Active |
| Gold Rush Plumbing Inc | C36 | 2014 | Active |
| Green's Plumbing | C36 | 2008 | Active |
| Gundlach's | C36 | 2022 | Active |
| Gunsolus Construction Inc | C36 | 2013 | Active |
| Hector's Plumbing Inc | C36 | 1993 | Active |
| Heros Plumbing Service LLC | C36 | 2019 | Active |
| Hometown Plumbing Sewer & Drain Inc | C36 | 2004 | Active |
| Honest Plumber Inc The | C36 | 2019 | Active |
| HPS Plumbing Services | C36 | 2001 | Active |
| Independent Mechanical Plumbing Inc | C36 | 2011 | Active |
| J A Praut Plumbing Inc | C36 | 2025 | Active |
| J's Plumbing LLC | C36 | 2024 | Active |
| Jimenez Brothers Plumbing Inc | C36 | 2023 | Active |
| Joe Pergis Plumbing LLC | C36 | 2017 | Active |
| Johnson & Sons Plumbing Inc | C36 | 1997 | Renew by Oct 31, 2026 |
| Kern Plumbing & Backflow Services Inc | C36 | 2008 | Active |
| LB Gonzales Inc | C36 | 1990 | Active |
| Louies Sewer & Drain Service Inc | C36 | 2013 | Active |
| Loyal Plumbing Inc | C36 | 2019 | Active |
| LT Platinum Plumbing And Mechanical Inc | C36 | 2025 | Active |
| MC Kenney's Air Conditioning Inc | C36 | 1983 | Active |
| McKee Ward Mechanical Inc | C36 | 2015 | Active |
| Midstate Sheetmetal Inc | C36 | 2004 | Active |
| Mission Mechanical Plumbing Inc | C36 | 2009 | Active |
| Monarch Home Services | C36 | 2008 | Active |
| MS Plumbing And Rooter Inc | C36 | 2024 | Active |
| National Engineering & Development | C36 | 2026 | Active |
| Nimo's Plumbing Inc | C36 | 2017 | Active |
| Oasis Air And Solar | C36 | 2018 | Active |
| Oasis Air Conditioning Inc | C36 | 1974 | Active |
| Oxford Dustin Plumbing Inc | C36 | 2015 | Active |
| P I E Con Inc | C36 | 2008 | Active |
| Pacific Coast Energy Conservation Services Inc | C36 | 2008 | Active |
| Pen-Rose Plumbing Co | C36 | 2024 | Renew by Oct 31, 2026 |
| Phillips Mechanical & Plumbing Inc | C36 | 2014 | Active |
| Precision Plumbing And Drain Inc | C36 | 2021 | Active |
| Pro Restoration Services Inc | C36 | 2011 | Active |
| Prodigy Flow Plumbing LLC | C36 | 2022 | Active |
| Rivera's Plumbing | C36 | 2019 | Active |
| Ron's Speedy Rooter & Plumbing | C36 | 2008 | Active |
| Ruiz Plumbing And Rooter Co | C36 | 2015 | Active |
| S & P Mechanical Inc | C36 | 1995 | Active |
| Serda's Plumbing Inc | C36 | 1992 | Active |
| Sky Royal Plumbing Sewer & Drain Inc | C36 | 2023 | Active |
| Slater Plumbing & Mechanical Inc | C36 | 1998 | Active |
| Stan's Discount Rooter And Plumbing Repair Inc | C36 | 1991 | Active |
| Staples Energy | C36 | 2007 | Active |
| Stockdale Aire Inc | C36 | 1983 | Active |
| Sunset Mechanical & Construction Inc | C36 | 1990 | Active |
| Superior Septic Service Inc | C36 | 2019 | Active |
| Titan Plumbing Inc | C36 | 2020 | Active |
| Todd's Plumbing Service Inc | C36 | 1993 | Active |
| Tony's Backhoe Service Inc | C36 | 2016 | Active |
| Top Grade Plumbing Inc | C36 | 2024 | Active |
| Trademark Construction Services Inc | C36 | 2004 | Active |
| Transparency Heating And Cooling | C36 | 2026 | Active |
| Vela's Plumbing Inc | C36 | 2025 | Active |
| Water Services | C36 | 2022 | Active |