| Geo-accumulation index (Igeo) | Enrichment Factor (EF) | Contamination Factor (CF) | Pollution Load index (PLI) | |||||
| Igeo | Igeo class | Sediment quality | EF Value | Nature of enrichment | CF Value | Pollution level | PLI | Indication |
| 0 | 0 | Not polluted | EF<2 | Deficiency to mineral enrichment | CF < 1 | Low | 0 | Perfection |
| 0 ≤ Igeo <1 | 1 | Not polluted to moderately polluted | EF = 2 - 5 | Moderate enrichment | 1 ≤ CF < 3 | Moderate | =1 | Baseline level |
| 1 ≤ Igeo < 2 | 2 | Moderately polluted | EF = 5 - 20 | Significant enrichment | 3 ≤ CF < 6 | Considerable | >1 | Polluted |
| 2 ≤ Igeo < 3 | 3 | Moderately to strongly polluted | EF = 20 - 40 | Very high enrichment | CF ≥ 6 | Very high |
|
|
| 3 ≤ Igeo < 4 | 4 | Strongly polluted | EF > 40 | Extremely high enrichment |
|
|
|
|
| 4 ≤ Igeo < 5 | 5 | Strongly to extremely polluted |
|
|
|
|
|
|
| Igeo ≥ 5 | 6 | Extremely polluted |
|
|
|
|
|
|