| A H I Construction Inc | C36 + A, ASB, B +4 | 2004 | Active |
| Abc Plumbing Heating And Air Conditioning | C36 + C16, C20, C42 | 1981 | Active |
| Abc Service | C36 + C42 | 2004 | Active |
| Abm Building Solutions LLC | C36 + B, C4, C7 +6 | 2012 | Active |
| Ace Plumbing Heating & Air | C36 + C20, C42 | 1975 | Active |
| Acknowledge Plumbing | C36 | 2023 | Active |
| Acqua Inc | C36 + C10, C31, C34 | 2026 | Active |
| Affordable Plumbing Heating & Air Inc | C36 + C20 | 2022 | Active |
| Airco Mechanical Inc | C36 + A, B, C2 +8 | 1975 | Active |
| All Year Inc | C36 + B, C2, C10 +1 | 1981 | Active |
| Alpha Pros Plumbing LLC | C36 | 2024 | Active |
| America's Plumbing Co Inc | C36 | 1999 | Active |
| Amigos Plumbing And Drain Cleaning Inc | C36 | 2026 | Active |
| Analgesic Services Inc | C36 | 1996 | Active |
| Anderson's Plumbing Inc | C36 | 2016 | Active |
| Aps 916 LLC | C36 | 2025 | Active |
| Arctic HVAC Solutions | C36 + B, C10, C20 | 2024 | Active |
| Armstrong Plumbing Inc | C36 + C16, C42 | 1978 | Active |
| Artwork Unlimited Inc | C36 + B, C10 | 2010 | Renew by Nov 30, 2026 |
| Asap Plumbing & Drain | C36 | 2022 | Active |
| Atticman Heating & Air Conditioning Insulation Inc | C36 + C2, C10, C20 | 2018 | Active |
| B - Line Construction Inc | C36 + B, C10, C33 | 1999 | Active |
| B Line Construction LLC | C36 + B, C10 | 2025 | Active |
| Bates Construction Company | C36 + A, B, C10 +1 | 1990 | Active |
| Bath Fitter Northern California | C36 + D12, D34 | 2013 | Active |
| Beaver Brothers Plumbing Inc | C36 | 2025 | Active |
| Bella's Plumbing | C36 | 2023 | Active |
| Benning Design Construction | C36 + B, C10 | 2002 | Active |
| Best Plumbing | C36 | 2025 | Active |
| Big Mountain Heating And Air Inc | C36 + B, C17, C20 +1 | 2006 | Active |
| Bosley Electric Contracting Company | C36 + B, C10 | 1979 | Active |
| Brown's Heating And Air Inc | C36 + C20 | 2008 | Active |
| Buffalo Mechanical | C36 + B, C2, C4 +3 | 2025 | Active |
| Cal-Delta Plumbing Inc | C36 | 1988 | Active |
| Capitol City Plumbing | C36 | 2024 | Renew by Nov 30, 2026 |
| Choice Plumbing Inc | C36 | 2021 | Active |
| Clear View GS LLC | C36 | 2026 | Active |
| Community Resource Project Inc | C36 + B, C17, C20 | 1991 | Active |
| Cooper Oates Air Conditioning Inc | C36 + C10, C20, C38 +1 | 1991 | Active |
| D & D Plumbing | C36 + A, B | 1992 | Active |
| D & J Plumbing - Commercial | C36 | 1998 | Active |
| D & J Plumbing Inc | C36 | 1983 | Active |
| D D K Mechanical Inc | C36 + B, C20, C43 | 2005 | Active |
| Diversified Plumbing Inc | C36 | 1992 | Active |
| Division One Plumbing | C36 | 2026 | Active |
| Doggonit Plumbing And Drain | C36 | 2024 | Active |
| Double R Plumbing | C36 | 2025 | Active |
| Drain Care Plumbing | C36 | 2025 | Active |
| Ducks Plumbing Heating Air | C36 + C20 | 2017 | Active |
| E Guy & Son Plumbing | C36 | 2017 | Active |
| Early Bird Plumbing | C36 | 2005 | Active |
| Efficient Energy Solutions Inc | C36 + B, C2, C10 +5 | 1978 | Active |
| Elite Service Experts Inc | C36 + B, C10, C27 +1 | 2017 | Active |
| Ellis Heating & Air | C36 + C20 | 2004 | Active |
| Ellis L G Plumbing Inc | C36 + A, C4, C16 +3 | 1979 | Active |
| Envision Contracting Inc | C36 + B, D34 | 2019 | Active |
| Fast Lane Development Ca LLC | C36 + A, B, C10 +1 | 2025 | Active |
| Fat Cat Plumbing LLC | C36 + B | 1998 | Active |
| Fix N Flow Plumbing | C36 | 2025 | Active |
| Flowline Plumbing Inc | C36 + B | 2023 | Active |
| Foundation Four Construction LLC | C36 + B, C20 | 2026 | Active |
| Gates Plumbing & Drain Service | C36 | 2024 | Active |
| Glenn Thornton Plumbing Inc | C36 | 2012 | Active |
| Goldenline Plumbing LLC | C36 | 2026 | Active |
| Heritage Plumbing | C36 | 1998 | Active |
| Holley Brothers Plumbing | C36 | 2026 | Active |
| Home River Property Services | C36 + B | 1999 | Active |
| Howdy Plumbing LLC | C36 | 2024 | Active |
| Hydrochap Plumbing Inc | C36 | 2025 | Active |
| Ideal Plumbing | C36 + B | 2021 | Active |
| Indoor Environmental Services | C36 + C4, C20, C38 +1 | 1992 | Active |
| Iron Grip Plumbing & Repipe | C36 | 2026 | Active |
| Iron Mechanical Inc | C36 + B, C2, C4 +3 | 2009 | Active |
| J & L Plumbing Inc | C36 | 2014 | Active |
| James 516b Plumbing LLC | C36 | 2025 | Active |
| James Long Construction Services Inc | C36 + B, C4, C7 +2 | 2003 | Active |
| Jeff's Plumbing | C36 + B | 1995 | Active |
| K&L Plumbing LLC | C36 | 2025 | Active |
| Ken's Construction & Remodel Inc | C36 + B | 2023 | Active |
| Kitchell / Cem Inc | C36 + B, C10, C20 | 2010 | Active |
| Kline-Youngblood Construction | C36 + B | 1984 | Active |
| L G Backhoe Service Inc | C36 + C16, C34, C42 | 1987 | Active |
| Lawson Mechanical Contractors | C36 + A, ASB, B +7 | 1958 | Active |
| Lawson Mechanical Contractors LLC | C36 + A, ASB, B +7 | 2023 | Active |
| Lawson SSP Group LLC | C36 + A, ASB, B +7 | 2023 | Active |
| Lemon Tree Construction Inc | C36 + B, C10 | 2023 | Active |
| Leo & Sons Plumbing LLC | C36 | 2018 | Active |
| Lodem Mechanical Inc | C36 | 2025 | Active |
| M3 Mep LLC | C36 + A, B, C4 +4 | 2022 | Renew by Nov 30, 2026 |
| M3 Service LLC | C36 + A, B, C4 +4 | 2022 | Active |
| Mark III Construction Inc | C36 + A, B, C4 +4 | 2010 | Active |
| MB Plumbing Solutions Inc | C36 | 2026 | Active |
| Millennium Plumbing Specialist | C36 | 2021 | Active |
| MJL Plumbing Inc | C36 | 2025 | Active |
| Modern Plumbing Solutions | C36 | 2025 | Active |
| Mr Rooter Plumbing | C36 | 2025 | Active |
| Mr Rooter Plumbing | C36 | 2002 | Active |
| MVP Plumbing & Sewer Inc | C36 | 2024 | Active |
| Nextdoor Plumbing Repair Services Inc | C36 | 2022 | Active |
| Nmi Industrial Holdings LLC | C36 + A, B, C11 +3 | 2010 | Active |