| Countries | Less than 0.8 mgNO₃-N/l (%) | 0.8-2.0 mgNO₃-N/l (%) | 2.0-3.6 mgNO₃-N/l (%) | 3.6-5.6 mgNO₃-N/l (%) | 5.6-11.3 mgNO₃-N/l (% | Greater than 11.3 mgNO₃-N/l (%) |
|---|---|---|---|---|---|---|
| Albania (26) | 100 | 0 | 0 | 0 | 0 | 0 |
| Austria (94) | 35.1 | 37.2 | 20.2 | 6.4 | 1.1 | 0 |
| Belgium (108) | 0.9 | 13 | 41.7 | 35.2 | 9.3 | 0 |
| Croatia (49) | 61.2 | 38.8 | 0 | 0 | 0 | 0 |
| Cyprus (24) | 79.2 | 16.7 | 4.2 | 0 | 0 | 0 |
| Czechia (795) | 6.5 | 23.4 | 30.6 | 24.2 | 14.5 | 0.9 |
| Denmark (40) | 0 | 15 | 42.5 | 40 | 2.5 | 0 |
| Estonia (155) | 38.1 | 31.6 | 18.1 | 5.2 | 7.1 | 0 |
| Finland (108) | 88 | 10.2 | 1.9 | 0 | 0 | 0 |
| France (15) | 26.7 | 26.7 | 20 | 13.3 | 6.7 | 6.7 |
| Germany (247) | 6.5 | 20.6 | 47.4 | 23.5 | 2 | 0 |
| Greece (234) | 56 | 28.6 | 7.7 | 5.6 | 1.7 | 0.4 |
| Iceland (2) | 100 | 0 | 0 | 0 | 0 | 0 |
| Ireland (182) | 44 | 24.7 | 19.8 | 9.3 | 2.2 | 0 |
| Italy (2730) | 38.3 | 32.8 | 16.6 | 8.1 | 3.8 | 0.4 |
| Kosovo* (49) | 36.7 | 57.1 | 6.1 | 0 | 0 | 0 |
| Latvia (61) | 29.5 | 26.2 | 19.7 | 9.8 | 13.1 | 1.6 |
| Lithuania (463) | 14.3 | 27.2 | 16.6 | 16.8 | 22.5 | 2.6 |
| North Macedonia (18) | 50 | 50 | 0 | 0 | 0 | 0 |
| Norway (131) | 99.2 | 0.8 | 0 | 0 | 0 | 0 |
| Poland (3331) | 33.2 | 34.9 | 17.7 | 7.1 | 5.5 | 1.6 |
| Portugal (122) | 57.4 | 30.3 | 9 | 1.6 | 1.6 | 0 |
| Romania (120) | 52.5 | 41.7 | 5 | 0.8 | 0 | 0 |
| Serbia (35) | 37.1 | 62.9 | 0 | 0 | 0 | 0 |
| Slovakia (16) | 0 | 68.8 | 31.3 | 0 | 0 | 0 |
| Slovenia (21) | 42.9 | 57.1 | 0 | 0 | 0 | 0 |
| Spain (3352) | 43 | 32.8 | 12.5 | 5.5 | 4.8 | 1.3 |
| Sweden (126) | 75.4 | 15.1 | 4 | 4.8 | 0.8 | 0 |
| Switzerland (121) | 24.8 | 33.9 | 12.4 | 19.8 | 9.1 | 0 |