| E&J Plumbing Inc | C36 | 2025 | Active |
| East Design Construction Inc | C36 + B, C20 | 2020 | Active |
| Eaze Development Inc | C36 + B | 2024 | Renew by Dec 31, 2026 |
| Eco Pro Plumbing & Construction Inc | C36 + B | 2023 | Active |
| Edgar's Plumbing Service Inc | C36 | 1996 | Active |
| El Design Inc | C36 + B | 2022 | Active |
| Elan's Plumbing Solutions Inc | C36 | 2021 | Active |
| Eli Zepeda Plumbing Inc | C36 | 2025 | Active |
| Elim Plumbing Inc | C36 | 2018 | Active |
| Elow Cost Plumbing | C36 | 2021 | Active |
| Emergency Rooter Inc | C36 | 2017 | Active |
| Er Plumbing Inc | C36 | 2022 | Active |
| Esb Plumbing | C36 | 2020 | Active |
| Esco Plumbing Services Inc | C36 | 2025 | Active |
| Estep & Sons Inc | C36 + C16 | 1988 | Active |
| Estrada Plumbing & Remodeling Inc | C36 + B | 2002 | Active |
| Evergreen Construction | C36 + B, C20 | 2018 | Active |
| Evergreen Electric Construction Inc | C36 + C10 | 1990 | Active |
| Famous Plumbing Inc | C36 | 2004 | Active |
| Fire Pumps R US | C36 + C10, C16, C20 | 2004 | Active |
| First Pacific Development Inc | C36 + A, B, C10 | 2004 | Active |
| First Plumbing Construction Inc | C36 + B | 2022 | Active |
| Flo Heating & Air Inc | C36 + B, C20 | 2025 | Active |
| Flowtech - M N G Plumbing Co | C36 | 1998 | Active |
| Forge & Frame Inc | C36 + B | 2005 | Active |
| G R Plumbing Inc | C36 | 2018 | Renew by Dec 31, 2026 |
| Gala General Construction Inc | C36 + B, C27 | 2022 | Renew by Nov 30, 2026 |
| GBS Company | C36 + B, C10, C16 +2 | 2009 | Active |
| GCH Plumbing Inc | C36 + C42 | 2004 | Active |
| Geonosis Construction Inc | C36 + B, C54 | 2023 | Active |
| Gloria Plumbing Inc | C36 | 2013 | Active |
| Gopar's Plumbing Corp | C36 | 2023 | Active |
| Green Planet Plumbing | C36 + B | 2010 | Active |
| Greene & Son Plumbing Inc | C36 | 2005 | Active |
| Greywater Corps Incorporated | C36 + B | 2015 | Active |
| Guillen's Specialty Plumbing | C36 | 2024 | Active |
| H N Harris Plumbing Inc | C36 + B, C10 | 2008 | Active |
| H R R Plumbing Inc | C36 | 2021 | Active |
| H2o Eagle Plumbing Inc | C36 | 2023 | Active |
| Hagen Plumbing & Heating Inc | C36 | 2005 | Active |
| Hami Construction Inc | C36 + A, B, C10 | 2023 | Active |
| Happy Hippo Plumbing And Home Services Inc | C36 + A | 2017 | Active |
| Harari Construction Inc | C36 + B, C8 | 2016 | Active |
| Heflin & E Paul Plumbing Inc | C36 + C20 | 1961 | Active |
| Hello Plumbing Corporation | C36 | 2014 | Active |
| Henrik Plumbing Inc | C36 | 1997 | Active |
| High Quality Plumbing La Inc | C36 | 2017 | Active |
| Highway Masters Paving | C36 + A, B, C10 | 2020 | Active |
| HK Zone Construction Inc | C36 + B, C8, C10 +1 | 2023 | Active |
| Hollywood Contractor Corp | C36 + B, D30 | 2022 | Active |
| Hydro Pros Plumbing And Drain Services | C36 | 2025 | Active |
| Infinity Plumbing Inc | C36 | 2002 | Renew by Dec 31, 2026 |
| Iron Plumbing GT Inc | C36 | 2026 | Active |
| It'Splumber Inc | C36 | 2023 | Active |
| J And M Plumbing Inc | C36 | 2026 | Active |
| J F L Electric Inc | C36 + A, B, C10 +1 | 1989 | Active |
| JB Pro Plumbing Co | C36 | 2023 | Active |
| Jb#1 Plumbing | C36 | 2023 | Active |
| Jink Plumbing Inc | C36 + B | 2021 | Active |
| Jireh Prime Electric | C36 + B, C10 | 2025 | Active |
| JLB Plumbing | C36 | 2016 | Active |
| JNH Builders Inc | C36 + B, C10 | 2026 | Active |
| Jo-Mi Plumbing & Solar Inc | C36 + C20, C46 | 1966 | Active |
| John's Plumbing & Drain Services | C36 | 2008 | Active |
| Joshua Krom Inc | C36 + B, C8 | 2009 | Active |
| Jr Plumbing & Rooter Inc | C36 | 2018 | Active |
| Jr Plumbing Solutions | C36 | 2025 | Active |
| JS Plumbing & Construction Inc | C36 + B, C10, C33 | 2004 | Active |
| Jv's Plumbing & Rooter Inc | C36 | 2022 | Active |
| K S And W Creative Plumbing | C36 | 1998 | Active |
| Kaiser Plumbing Inc | C36 | 2001 | Active |
| King Building Construction | C36 + B, C10 | 2026 | Active |
| L A Fire Protection Service Inc | C36 + C10, C16 | 2022 | Active |
| L A General Contracting | C36 + A, B | 2008 | Renew by Dec 31, 2026 |
| L A Low Flush Toilets Inc | C36 | 1999 | Active |
| La Brea Heating And Air Conditioning Co Inc | C36 + B, C4, C10 +3 | 1991 | Active |
| La Sustainable Plumbing Inc | C36 | 1994 | Active |
| La Tamix Plumbing Inc | C36 | 2018 | Active |
| Lara Residential Construction Inc | C36 + B, C16 | 2025 | Active |
| Leak Busters Plumbing LLC | C36 | 2026 | Active |
| Legion Builders Group | C36 + A, B, C15 +3 | 2019 | Active |
| Lighthart Corporation The | C36 + A, B, C4 +6 | 1990 | Active |
| Lipson Plumbing & Heating Inc | C36 + C16, C20 | 1985 | Active |
| Llayee Construction Inc | C36 + B | 2017 | Active |
| Lopez E & J Plumbing Inc | C36 | 2012 | Active |
| Los Angeles Conservation Corps Inc | C36 + B, C10, C27 +2 | 2010 | Active |
| LR Services Plumbing Division | C36 | 2003 | Active |
| Luckett & Sons Construction Company | C36 + B | 1992 | Renew by Dec 31, 2026 |
| Lux Plumbing Solutions | C36 | 2025 | Active |
| M & M Jetting Services Inc | C36 | 2026 | Active |
| M Brothers Plumbing & Maintenance Co | C36 | 2001 | Active |
| Mabuhay Plumbing & Rooter Service | C36 | 2002 | Active |
| Magnet Plumbing Inc | C36 | 2016 | Active |
| Major League Plumbing Inc | C36 | 2020 | Active |
| Make It Right Plumbing | C36 | 2015 | Active |
| Mario's Plumbing Services | C36 | 2021 | Active |
| Martin Plumbing Services | C36 | 2014 | Active |
| Martinez Rivera Plumbing Inc | C36 + B | 2025 | Active |
| Mata Plumbing | C36 | 2018 | Active |
| Mazariego Plumbing Inc | C36 | 2015 | Active |