| Heavy metals (mg/kg) | Station 1 (NBRB) | Station 2 (NGRB) | Station 3 (WMRB) | WHO | WSRA |
| As | 3.55 | 0.20 | 15.85 | 20.0 | 10.0 |
| Cd | 2.10 | 1.85 | 2.80 | 3.0 | 0.3 |
| Cr | 3.55 | 0.20 | 15.50 | 100.0 | 71.0 |
| Pb | 102.0 | 46.0 | 17.0 | 100.0 | 16.0 |
| Mn | 145.5 | 75.0 | 253.5 | 2000.0 | 750.0 |
| Fe | 9454.0 | 8928.0 | 13657.0 | 5000.0 | 300.0 |
| Cu | 293.0 | 84.50 | 118.0 | 100.0 | 32 |
| Zn | 18.00 | 14.00 | 27.00 | 300.00 | 127.0 |