| 925.17 Civil Engineering |
| 925.19 Concrete Engineering |
| 925.22 Control Systems Engineering |
| 925.28 Drainage Engineering |
| 925.33 Engineer Services, Professional |
| 925.35 Environmental Engineering |
| 925.36 Engineering Services (Not Otherwise Classified) |
| 925.37 Facilities Design Services, Engineering |
| 925.38 Field Engineering |
| 968.92 Water Supply Plant Operating and Monitoring System Services (Including Water Resources Development and Water Quality Management Services) |