| Business | Phone |
| Anderson Drilling 10303 Channel Rd, Lakeside 92040 | (619) 443-3891 |
| Centaur General Engineering Po Box 22, Lakeside 92040 | (619) 445-6659 |
| El Cajon Grading & Engineering 13684 Highway 8 Business, Lakeside 92040 | (619) 561-9840 |
| Erreca's Inc 12570 Highway 67, Lakeside 92040 | (619) 390-6400 |
| Fsg General Engineering Po Box 1382, Lakeside 92040 | (619) 443-6998 |
| M J Baxter Drilling Co 12485 Highway 67, Lakeside 92040 | (619) 443-7800 |
| Overson-Rand Corp 10194 Riverford Rd, Lakeside 92040 | (619) 258-5900 |
| R L Chambers Inc 11392 Crazy Horse Dr, Lakeside 92040 | (619) 561-3917 |
| S D Engineering 12243 Highway 67, Lakeside 92040 | (619) 561-4200 |
| Straightline Engineering Po Box 1184, Lakeside 92040 | (619) 443-3313 |
| Marathon Construction Corp 10108 Riverford Rd, Lakeside 92040 | (619) 276-4401 |