| Business | Phone |
| Aquaterra Engineering Inc 1843 Campesino Pl, Oceanside 92054 | (760) 439-2802 |
| Buccola Engineering Inc 3142 Vista Way # 301, Oceanside 92056 | (760) 721-2000 |
| Cornerstone Engineering 620 Mission Ave, Oceanside 92054 | (760) 722-3495 |
| Fraser Engineering Inc 2191 S El Camino Real # 105, Oceanside 92054 | (760) 722-3495 |
| Golden & Assoc 2233 Maxson St, Oceanside 92054 | (760) 967-6248 |