| Value | Category | Cases | |
|---|---|---|---|
| 1 | porous cesspit | 80 | 
                                                                 
                                    
                                    30.2%
                                 
                                                             | 
                                                        
                    
| 2 | Sewage network | 37 | 
                                                                 
                                    
                                    14%
                                 
                                                             | 
                                                        
                    
| 3 | tight cesspit | 114 | 
                                                                 
                                    
                                    43%
                                 
                                                             | 
                                                        
                    
| 4 | Other | 34 | 
                                                                 
                                    
                                    12.8%
                                 
                                                             |