Table 2: Classification of water contamination based on enrichment factor indicesin accordance with Soliman [22].
| Class | Enrichment factor value | Enrichment from anthropogenic activities |
| 1 | EF < 2 | Deficiency to minimal enrichment |
| 2 | 2 < EF < 5 | Moderate enrichment |
| 3 | 5 < EF < 20 | Significant enrichment |
| 4 | 20 < EF < 40 | Very high enrichment |
| 5 | EF > 40 | Extremely high enrichment |