| Country | Period | Ground-water bodies | Very negative | Marginally negative | No change | Marginally positive | Very positive | Sen slope (mg/l NO3) | Sen slope (%) |
|---|---|---|---|---|---|---|---|---|---|
| Europe | 1992-2018 | 542 | 138 | 20 | 225 | 14 | 145 | 0.0 | 3.0 |
| Austria | 1992-2018 | 13 | 7 | 1 | 5 | 0 | 0 | -0.2 | -0.8 |
| Belgium | 1992-2018 | 20 | 2 | 0 | 8 | 1 | 9 | 0.1 | 0.8 |
| Bulgaria | 1992-2018 | 24 | 4 | 1 | 11 | 0 | 8 | 0.4 | 1.8 |
| Denmark | 1992-2018 | 84 | 16 | 3 | 32 | 3 | 30 | 0.1 | 10.6 |
| Estonia | 1992-2018 | 17 | 1 | 0 | 10 | 2 | 4 | 0.1 | 4.6 |
| Finland | 1992-2018 | 8 | 3 | 0 | 4 | 1 | 0 | 0.0 | -1.6 |
| France | 1992-2018 | 248 | 62 | 10 | 103 | 6 | 67 | 0.0 | 0.9 |
| Germany | 1992-2018 | 66 | 11 | 4 | 31 | 1 | 19 | 0.0 | 6.0 |
| Ireland | 1992-2018 | 51 | 28 | 1 | 17 | 0 | 5 | -0.2 | -0.1 |
| Portugal | 1992-2018 | 2 | 1 | 0 | 1 | 0 | 0 | -0.6 | -2.7 |
| Slovakia | 1992-2018 | 4 | 2 | 0 | 1 | 0 | 1 | -0.4 | 3.0 |
| Slovenia | 1992-2018 | 5 | 1 | 0 | 2 | 0 | 2 | -0.2 | -0.1 |
| Europe | 2000-2018 | 1077 | 208 | 48 | 550 | 54 | 217 | 0.0 | 2.9 |
| Austria | 2000-2018 | 14 | 7 | 1 | 6 | 0 | 0 | -0.2 | -0.7 |
| Belgium | 2000-2018 | 34 | 4 | 2 | 21 | 1 | 6 | -0.2 | -0.2 |
| Bulgaria | 2000-2018 | 40 | 3 | 2 | 17 | 1 | 17 | 0.4 | 4.6 |
| Cyprus | 2000-2018 | 5 | 0 | 0 | 2 | 0 | 3 | 3.3 | 10.4 |
| Czechia | 2000-2018 | 64 | 19 | 2 | 20 | 1 | 22 | -0.2 | 2.3 |
| Denmark | 2000-2018 | 89 | 17 | 3 | 29 | 6 | 34 | 0.0 | 13.6 |
| Estonia | 2000-2018 | 20 | 1 | 0 | 14 | 1 | 4 | 0.1 | 3.5 |
| Finland | 2000-2018 | 9 | 5 | 0 | 3 | 1 | 0 | 0.0 | -4.3 |
| France | 2000-2018 | 441 | 77 | 18 | 236 | 27 | 83 | 0.0 | 1.0 |
| Germany | 2000-2018 | 175 | 23 | 3 | 115 | 11 | 23 | 0.0 | 3.2 |
| Ireland | 2000-2018 | 68 | 25 | 8 | 30 | 0 | 5 | -0.2 | -0.1 |
| Malta | 2000-2018 | 2 | 0 | 0 | 2 | 0 | 0 | 0.5 | 1.3 |
| Portugal | 2000-2018 | 10 | 3 | 0 | 7 | 0 | 0 | -0.3 | -1.1 |
| Serbia | 2000-2018 | 21 | 1 | 0 | 9 | 2 | 9 | 0.3 | 20.3 |
| Slovakia | 2000-2018 | 16 | 4 | 0 | 7 | 1 | 4 | 0.0 | 1.0 |
| Slovenia | 2000-2018 | 6 | 1 | 0 | 4 | 1 | 0 | -0.2 | -0.7 |
| Spain | 2000-2018 | 26 | 4 | 4 | 11 | 1 | 6 | 0.2 | 3.6 |
| Switzerland | 2000-2018 | 37 | 14 | 5 | 17 | 0 | 1 | -0.2 | -0.8 |