Igeo value

Class

Designation of sediment quality

Igeo ≤ 0

0

Uncontaminated

0 ≤ Igeo ≤ 1

1

Uncontaminated to moderately contaminated

1 ≤ Igeo ≤ 2

2

Moderately contaminated

2 ≤ Igeo ≤ 3

3

Moderately to strongly contaminated

3 ≤ Igeo ≤ 4

4

Strongly contaminated

4 ≤ Igeo ≤ 5

5

Strongly to extremely contaminated

Igeo > 6

6

Extremely contaminated