| Business | Phone |
| Blackhawk Engineering Inc 118 Blackhawk Ln, Cedar Falls 50613 | (319) 266-2681 |
| Robinson Engineering Co 5751 Westminster Dr, Cedar Falls 50613 | (319) 859-0293 |
| Shoff Consulting Engineer 209 Franklin St A2, Cedar Falls 50613 | (319) 266-0258 |
| Diedrichs & Assoc 209 Franklin St, Cedar Falls 50613 | (319) 266-0549 |
| Van Winkle-Jacob Engineering 1501 Technology Pkwy 100, Cedar Falls 50613 | (319) 266-5829 |