| Business | Phone |
| Academy Engineering 1070 Commerce St # E, San Marcos 92078 | (760) 471-7988 |
| Rural Community Assistance 417 E Carmel St # 204, San Marcos 92078 | (760) 471-5612 |
| Pcr Mobile Laboratories 197 Woodland Pkwy, San Marcos 92069 | (760) 630-5106 |
| Diamond Environmental Svc 805 E Mission Rd, San Marcos 92069 | (760) 682-0354 |
| Dpra 100 E San Marcos Blvd # 308, San Marcos 92069 | (760) 752-8342 |