| CSI Code | Short Description | Extended Description |
| 11300 | Fluid Waste Treatment and Disposal Equipment |
| 11310 | Sewage and Sludge Pump | Oil - Water Separators Packaged Pump Stations Sewage Ejectors |
| 11320 | Grit Collecting Equipment |
| 11330 | Screening and Grinding Equipment |
| 11335 | Sedimentation Tank Equipment |
| 11340 | Scum Removal Equipment |
| 11345 | Chemical Equipment |
| 11350 | Sludge Handling and Treatment Equipment |
| 11360 | Filter Press Equipment |
| 11365 | Trickling Filter Equipment |
| 11370 | Compressor |
| 11375 | Aeration Equipment |
| 11380 | Sludge Digestion Equipment |
| 11385 | Digester Mixing Equipment |
| 11390 | Package Sewage Treatment Plant |