| Condition variable | Subvariable | Unit | Condition 2015 | Condition 2018 | Condition 2021 |
|---|---|---|---|---|---|
| - = No figures or magnitude zero. . = Numerical value unknown or not to be disclosed. | |||||
| Nitrate-Nitrogen (rivers) | Quality category I | share of measuring points | - | - | - |
| Quality category II | share of measuring points | 0.02 | 0.02 | 0.02 | |
| Quality category III | share of measuring points | 0.30 | 0.31 | 0.31 | |
| Quality category IV | share of measuring points | 0.64 | 0.64 | 0.64 | |
| Quality category V | share of measuring points | 0.04 | 0.03 | 0.02 | |
| Quality category VI | share of measuring points | - | - | - | |
| Quality category VII | share of measuring points | - | - | - | |
| Measuring points | number | 255 | 255 | 256 | |
| Total phosphorus (rivers) | Quality category I | share of measuring points | 0.10 | 0.12 | 0.11 |
| Quality category I-II | share of measuring points | 0.10 | 0.08 | 0.09 | |
| Quality category II | share of measuring points | 0.09 | 0.17 | 0.16 | |
| Quality category II-III | share of measuring points | 0.62 | 0.49 | 0.50 | |
| Quality category III | share of measuring points | 0.06 | 0.01 | 0.01 | |
| Quality category III-IV | share of measuring points | 0.01 | 0.01 | 0.01 | |
| Quality category IV | share of measuring points | 0.01 | 0.01 | 0.01 | |
| Measuring points | number | 248 | 246 | 243 | |
| Bathing water quality (rivers) | Excellent | % of bathing waters in state | 0.67 | 0.72 | 0.72 |
| Good or sufficient | % of bathing waters in state | 0.11 | 0.08 | 0.14 | |
| Poor | % of bathing waters in state | - | 0.03 | 0.03 | |
| Unknown | % of bathing waters in state | 0.22 | 0.17 | 0.11 | |
| Measuring points | number | 36 | 36 | 36 | |
| Bathing water quality (lakes) | Excellent | % of bathing waters in state | 0.91 | 0.93 | 0.92 |
| Good or sufficient | % of bathing waters in state | 0.05 | 0.04 | 0.06 | |
| Poor | % of bathing waters in state | 0.00 | 0.00 | 0.01 | |
| Unknown | % of bathing waters in state | 0.04 | 0.03 | 0.01 | |
| Measuring points | number | 1,894 | 1,894 | 1,894 | |
| Characteristic bird species | Index (0 to 100) | 84.6 | 80.1 | . | |
| Protected areas | % | 44.6 | 44.6 | 44.7 | |
As at 25 April 2025