| Business | Phone |
| A & E Assoc 1415 W Garvey Ave N # 108, West Covina 91790 | (626) 962-0215 |
| Lopez & Assoc Engineers 2411 S Azusa Ave, West Covina 91792 | (626) 839-4484 |
| Us Infrastructure Inc 1500 W West Covina Pkwy, West Covina 91790 | (626) 472-7507 |
| H R Melohn 703 S Glendora Ave, West Covina 91790 | (626) 813-9993 |
| L Marvin Johnson Assoc Inc 822 S Montezuma Way, West Covina 91791 | (626) 919-1728 |