| Country | Less than 1.4 mgO₂/l | 1.4-2.0 mgO₂/l | 2.0-3.0 mgO₂/l | 3.0-4.0 mgO₂/l | Greater than 4.0 mgO₂/l |
|---|---|---|---|---|---|
| Albania (26) | 0.0 | 0.0 | 0.0 | 0.0 | 100.0 |
| Austria (94) | 68.1 | 18.1 | 12.8 | 1.1 | 0.0 |
| Belgium (108) | 39.8 | 13.9 | 33.3 | 5.6 | 7.4 |
| Bulgaria (101) | 25.7 | 18.8 | 29.7 | 14.9 | 10.9 |
| Croatia (49) | 63.3 | 8.2 | 12.2 | 2.0 | 14.3 |
| Cyprus (24) | 66.7 | 16.7 | 16.7 | 0.0 | 0.0 |
| Czechia (792) | 8.2 | 25.0 | 35.4 | 16.0 | 15.4 |
| Estonia (84) | 26.2 | 51.2 | 19.0 | 1.2 | 2.4 |
| Finland (6) | 50.0 | 33.3 | 16.7 | 0.0 | 0.0 |
| Germany (157) | 35.0 | 25.5 | 24.8 | 10.2 | 4.5 |
| Greece (127) | 46.5 | 14.2 | 16.5 | 8.7 | 14.2 |
| Ireland (182) | 91.2 | 8.2 | 0.5 | 0.0 | 0.0 |
| Italy (2,454) | 27.5 | 12.2 | 33.9 | 13.8 | 12.6 |
| Kosovo* (49) | 18.4 | 4.1 | 8.2 | 4.1 | 65.3 |
| Latvia (61) | 1.6 | 31.1 | 67.2 | 0.0 | 0.0 |
| Lithuania (463) | 17.1 | 40.2 | 33.7 | 7.1 | 1.9 |
| North Macedonia (18) | 0.0 | 11.1 | 38.9 | 11.1 | 38.9 |
| Poland (3,330) | 8.4 | 24.7 | 33.6 | 19.0 | 14.3 |
| Portugal (123) | 15.4 | 2.4 | 34.1 | 40.7 | 7.3 |
| Romania (121) | 0.0 | 37.2 | 19.8 | 24.0 | 19.0 |
| Serbia (35) | 5.7 | 42.9 | 40.0 | 11.4 | 0.0 |
| Slovakia (16) | 18.8 | 12.5 | 62.5 | 6.3 | 0.0 |
| Slovenia (20) | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Spain (2,604) | 0.2 | 1.1 | 56.9 | 4.3 | 37.5 |