Population connected to independent treatment | | 7.2145 | 7.6172 | 7.5178 | 7.3053 | 7.3608 | 7.1439 | 7.14 | 7.1439 |
 Total public sewerage (% of resident population connected to a wastewater collecting system) | | 92.79 | 92.38 | | 92.69 | 92.64 | 92.8561 | 92.86 | 92.8561 |
| Total public sewerage (% of resident population connected to a wastewater collecting system) | Population connected to the public sewerage without treatment | | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Public total treatment (connected to a wastewater treatment plant) | | 92.79 | 92.38 | 92.48 | 92.69 | 92.64 | 92.8561 | 92.86 | 92.8561 |
| Public total treatment (connected to a wastewater treatment plant) | Unspecified (other) treatment | | 0.0045 | -0.0028 | -0.0022 | -0.0047 | 0.0008 | 0 | 0 | 0 |
| Tertiary treatment | | | | | | | 50.8333 | 50.02 | 50.0467 |
| Secondary treatment | | | | | | | 23.6922 | 25.41 | 26.0879 |
| Primary treatment | | | | | | | 18.3307 | 17.43 | 16.7216 |
| Total connected to wastewater treatment | | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |