| Value | Category | Cases | |
|---|---|---|---|
| 1 | Wastewater Network | 1022 | 
                                                                 
                                    
                                    41.5%
                                 
                                                             | 
                                                        
                    
| 2 | Porous Cesspit | 1075 | 
                                                                 
                                    
                                    43.6%
                                 
                                                             | 
                                                        
                    
| 3 | Tight Cesspit | 359 | 
                                                                 
                                    
                                    14.6%
                                 
                                                             | 
                                                        
                    
| 4 | Other | 7 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             |