| Business | Phone |
| Smog Central 375 S Rancho Santa Fe Rd # 109, San Marcos 92078 | (760) 471-0770 |
| Smog Depot 755 W San Marcos Blvd, San Marcos 92078 | (760) 744-6608 |
| North County Smog Center Inc 1288 W San Marcos Blvd # 116, San Marcos 92078 | (760) 591-4859 |
| Garrett's Smog 3 821 S Rancho Santa Fe Rd, San Marcos 92078 | (760) 471-2179 |