| Business | Phone |
| 60 Minute Svc Po Box 501, Alta Loma 91701 | (909) 241-9053 |
| A & M Electric 6227 Sapphire St, Alta Loma 91701 | (909) 948-9993 |
| A J Electric 10098 Iron Mountain Ct, Alta Loma 91737 | (909) 941-1219 |
| Boal Electric 5660 Della Ave, Alta Loma 91701 | (909) 980-6331 |
| Dhillon Electric 9932 Banyan St, Alta Loma 91737 | (909) 944-8678 |
| E B Electric Alta Loma 91701 | (909) 941-4624 |
| J C Electrical 10826 Carriage Dr, Alta Loma 91737 | (909) 941-8990 |
| Lorraine Electric 9717 Whirlaway St, Alta Loma 91737 | (909) 980-4900 |
| G & G Electric Po Box 924, Alta Loma 91701 | (909) 989-2298 |
| Glad Tidings Management Svc 9616 Lemon Ave, Alta Loma 91737 | (909) 948-2831 |
| Romero Electric 10795 Deer Canyon Dr, Alta Loma 91737 | (909) 941-0383 |
| Sanders Service 6046 Carol Ave, Alta Loma 91701 | (909) 466-9225 |
| Thompson Electric 9044 Appaloosa Ct, Alta Loma 91737 | (909) 621-9879 |
| United Electric Po Box 1104, Alta Loma 91701 | (909) 867-4357 |
| AM Electric Services 6780 shaded wood place, Alta Loma 91701 | (909) 354-1879 |