| Country | Period | River stations | Very negative | Marginally negative | No change | Marginally positive | Very positive | Sen slope (mg/l NO3) | Sen slope (%) |
|---|---|---|---|---|---|---|---|---|---|
| Europe | 1992-2017 | 846 | 395 | 31 | 303 | 22 | 95 | -0.016 | -0.8 |
| Belgium | 1992-2017 | 28 | 16 | 1 | 11 | 0 | 0 | -0.046 | -1.1 |
| Czechia | 1992-2017 | 19 | 16 | 0 | 3 | 0 | 0 | -0.042 | -1.4 |
| Denmark | 1992-2017 | 37 | 37 | 0 | 0 | 0 | 0 | -0.141 | -2.9 |
| Estonia | 1992-2017 | 36 | 4 | 0 | 11 | 1 | 20 | 0.02 | 0.9 |
| Finland | 1992-2017 | 69 | 17 | 1 | 38 | 3 | 10 | 0.001 | -0.2 |
| France | 1992-2017 | 187 | 39 | 13 | 94 | 9 | 32 | -0.001 | -0.1 |
| Germany | 1992-2017 | 120 | 107 | 1 | 12 | 0 | 0 | -0.055 | -1.6 |
| Ireland | 1992-2017 | 4 | 1 | 0 | 3 | 0 | 0 | -0.003 | -0.5 |
| Latvia | 1992-2017 | 15 | 8 | 0 | 6 | 0 | 1 | -0.009 | -1.6 |
| Lithuania | 1992-2017 | 24 | 2 | 0 | 12 | 2 | 8 | 0.028 | 0.9 |
| Norway | 1992-2017 | 62 | 28 | 2 | 24 | 3 | 5 | 0.0 | -1.0 |
| Poland | 1992-2017 | 8 | 2 | 1 | 4 | 0 | 1 | -0.011 | -0.5 |
| Slovakia | 1992-2017 | 12 | 8 | 0 | 4 | 0 | 0 | -0.021 | -1.1 |
| Slovenia | 1992-2017 | 9 | 5 | 0 | 2 | 1 | 1 | -0.006 | -0.6 |
| Spain | 1992-2017 | 59 | 17 | 3 | 29 | 1 | 9 | 0.004 | -0.3 |
| Sweden | 1992-2017 | 110 | 64 | 8 | 34 | 2 | 2 | -0.007 | -1.1 |
| Switzerland | 1992-2017 | 6 | 2 | 0 | 3 | 0 | 1 | -0.004 | -0.1 |
| United Kingdom | 1992-2017 | 41 | 22 | 1 | 13 | 0 | 5 | 0.002 | -1.2 |
| Europe | 2000-2017 | 1213 | 432 | 68 | 586 | 30 | 97 | -0.014 | -0.9 |
| Belgium | 2000-2017 | 36 | 18 | 0 | 17 | 0 | 1 | -0.051 | -1.4 |
| Croatia | 2000-2017 | 22 | 11 | 4 | 7 | 0 | 0 | -0.015 | -2.7 |
| Cyprus | 2000-2017 | 13 | 11 | 0 | 2 | 0 | 0 | -0.103 | -7.5 |
| Czechia | 2000-2017 | 19 | 10 | 2 | 7 | 0 | 0 | -0.032 | -1.1 |
| Denmark | 2000-2017 | 38 | 32 | 3 | 3 | 0 | 0 | -0.1 | -2.4 |
| Estonia | 2000-2017 | 38 | 2 | 0 | 19 | 2 | 15 | 0.025 | 1.2 |
| Finland | 2000-2017 | 80 | 17 | 1 | 56 | 1 | 5 | -0.002 | -0.6 |
| France | 2000-2017 | 245 | 32 | 12 | 163 | 8 | 30 | -0.001 | -0.2 |
| Germany | 2000-2017 | 123 | 85 | 10 | 27 | 0 | 1 | -0.04 | -1.3 |
| Iceland | 2000-2017 | 1 | 1 | 0 | 0 | 0 | 0 | -0.002 | -5.6 |
| Ireland | 2000-2017 | 49 | 18 | 5 | 24 | 2 | 0 | -0.019 | -1.4 |
| Latvia | 2000-2017 | 18 | 2 | 2 | 10 | 2 | 2 | 0.011 | 0.3 |
| Lithuania | 2000-2017 | 24 | 1 | 1 | 13 | 5 | 4 | 0.035 | 1.1 |
| North Macedonia | 2000-2017 | 19 | 8 | 3 | 8 | 0 | 0 | -0.023 | -1.8 |
| Norway | 2000-2017 | 63 | 15 | 1 | 37 | 1 | 9 | 0.0 | -0.4 |
| Poland | 2000-2017 | 11 | 4 | 1 | 6 | 0 | 0 | -0.024 | -0.7 |
| Romania | 2000-2017 | 99 | 35 | 3 | 47 | 4 | 10 | -0.007 | -1.2 |
| Serbia | 2000-2017 | 31 | 19 | 3 | 6 | 2 | 1 | -0.025 | -2.1 |
| Slovakia | 2000-2017 | 12 | 5 | 0 | 7 | 0 | 0 | -0.019 | -1.0 |
| Slovenia | 2000-2017 | 11 | 5 | 2 | 4 | 0 | 0 | -0.007 | -1.0 |
| Spain | 2000-2017 | 93 | 27 | 7 | 46 | 2 | 11 | -0.014 | -0.7 |
| Sweden | 2000-2017 | 112 | 50 | 8 | 49 | 0 | 5 | -0.003 | -1.3 |
| Switzerland | 2000-2017 | 15 | 5 | 0 | 8 | 1 | 1 | -0.006 | -0.6 |
| United Kingdom | 2000-2017 | 41 | 19 | 0 | 20 | 0 | 2 | -0.006 | -1.9 |