| Business | Phone |
| Hoffman & Hoffman Trenching 3822 W Airline Hwy, Waterloo 50703 | (319) 232-4807 |
| Lehman Trucking & Excavating 323 Kothe St, Waterloo 50703 | (319) 235-6163 |
| Reilly Construction Co 2204 Easley St, Waterloo 50702 | (319) 232-7061 |
| Don Schmitz & Sons Inc 7031 Laporte Rd, Waterloo 50706 | (319) 296-1763 |
| Ernster & Co 520 Charles St, Waterloo 50703 | (319) 233-2782 |
| Watco Construction Inc 2920 Texas St, Waterloo 50702 | (319) 233-7481 |