Class | Igeo values | Sediment quality |
0 1 3 4 5 6 | Igeo ≤ 0 0 < Igeo < 1 2 < Igeo < 3 3 < Igeo < 4 4 < Igeo < 5 Igeo > 5 | Uncontaminated Uncontaminated to moderately Contaminated Moderately to heavily Contaminated Heavily contaminated Heavily to extreme contaminated Extremely contaminated |