| Value | Category | Cases | |
|---|---|---|---|
| 1 | Sewerage system | 7361 | 
                                                                 
                                    
                                    74.9%
                                 
                                                             | 
                                                        
                    
| 2 | Septic tank | 2292 | 
                                                                 
                                    
                                    23.3%
                                 
                                                             | 
                                                        
                    
| 3 | Open air | 169 | 
                                                                 
                                    
                                    1.7%
                                 
                                                             | 
                                                        
                    
| 4 | Other | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 37 |