| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1 | 1. Public network | 1381 | 384541 | 
                                                                 
                                    
                                    51.7%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 2 | 1. Porous cesspit | 1076 | 310021 | 
                                                                 
                                    
                                    41.6%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 3 | 2. Tight cesspit | 223 | 47271 | 
                                                                 
                                    
                                    6.3%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 4 | 2. Others | 13 | 2673 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             |