| Business | Phone |
| Alt Plumbing 757 N Twin Oaks Valley Rd # 7, San Marcos 92069 | (760) 761-1166 |
| Archibald Mga Plumbing 635 N Twin Oaks Valley Rd # 20, San Marcos 92069 | (760) 480-5808 |
| Brothers Plumbing Po Box 841, San Marcos 92079 | (760) 744-5956 |
| A & R Svc Co San Marcos 92078 | (760) 752-8900 |
| Albert Plumbing Heating & Air 820 Los Vallecitos Blvd # K, San Marcos 92069 | (760) 738-5550 |
| Scott Michael Plumbing 802 N Twin Oaks Valley Rd #109, San Marcos 92069 | (760) 744-2427 |
| S R Campbell Plumbing 340 Rancheros Dr, San Marcos 92069 | (760) 736-8316 |
| Paschall Plumbing Inc 288 Distribution St, San Marcos 92078 | (760) 410-1100 |
| Pacific Pointe Plumbing 1232 Los Vallecitos Blvd # 106, San Marcos 92069 | (760) 726-4400 |
| Danny Boy Plumbing San Marcos 92069 | (760) 744-1669 |
| J A Michaels Plumbing 1790 Low Chaparral Dr, San Marcos 92069 | (760) 744-2882 |