| Region | Category of filtering potential in % of used agricultural land | ||||
| Very low | Low | Medium | High | Very high | |
| Michalovce | 0.19 | 79.89 | 19.92 | 0.00 | 0.00 |
| Krupina | 0.00 | 46.19 | 2.21 | 22.07 | 29.53 |
| Brezno | 30.22 | 65.83 | 3.95 | 0.00 | 0.00 |
| Piešťany | 0.00 | 0.51 | 0.06 | 12.16 | 87.27 |