| 918.42 Engineering Consulting |
| 925.17 Civil Engineering |
| 925.28 Drainage Engineering |
| 925.33 Engineer Services, Professional |
| 925.35 Environmental Engineering |
| 925.36 Engineering Services (Not Otherwise Classified) |
| 925.55 Inspecting, General/Engineering |
| 925.58 Irrigation; Drainage; Flood Control/Engineering |
| 925.61 Land Development and Planning/Engineering |
| 925.70 Municipal Engineering |
| 925.87 Sewage Collection, Treatment, and Disposal/Engineering |
| 925.96 Waste Water Treatment Engineering |
| 925.97 Water Supply, Treatment, and Distribution/Engineering |