| Business | Phone |
| Alta Vista Engineering 969 Vale Terrace Dr # A, Vista 92084 | (760) 758-3955 |
| Private Eyes Engineers 1057 Sycamore Ave, Vista 92081 | (760) 599-8566 |
| Linden R Burzell Consltng Svc 1002 Bonnie Brae Pl, Vista 92084 | (760) 726-5856 |
| Hardwick Engineering & Assoc 2444 Rainbow Ct, Vista 92083 | (760) 630-5300 |
| J Osborn & Assoc Inc 2811 La Mirada Dr, Vista 92081 | (760) 560-1191 |