| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1 | Public network | 172 | 196 | 
                                    
                                    31.6%
                                 | 
| 2 | Tight Cesspit | 50 | 61 | 
                                    
                                    9.8%
                                 | 
| 3 | Porous Cesspit | 321 | 353 | 
                                    
                                    56.9%
                                 | 
| 4 | Others | 11 | 11 | 
                                    
                                    1.8%
                                 |