| Value | Category | Cases | |
|---|---|---|---|
| 1 | Wastewater Network | 921 | 
                                                                 
                                    
                                    37.4%
                                 
                                                             | 
                                                        
                    
| 2 | Porous Cesspit | 771 | 
                                                                 
                                    
                                    31.3%
                                 
                                                             | 
                                                        
                    
| 3 | Tight Cesspit | 283 | 
                                                                 
                                    
                                    11.5%
                                 
                                                             | 
                                                        
                    
| 4 | Othe | 287 | 
                                                                 
                                    
                                    11.7%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 201 |