| Igeo | Igeo class | Description of sediment quality |
| <0 | 0 | Uncontaminated |
| 0 - 1 | 1 | Uncontaminated to moderately contaminated |
| 1 - 2 | 2 | Moderately contaminated |
| 2 - 3 | 3 | Moderately to strongly contaminated |
| 3 - 4 | 4 | Strongly contaminated |
| 4 - 5 | 5 | Strongly to extremely strongly contaminated |
| >5 | 6 | Extremely contaminated |