| MRB3 | MMR4 | LOM2 | LOM3 | WHO (µg/L) | |
| Pb | 100 | 100 | 100 | 100 | 10 |
| Cd | 50 | 50 | 50 | 50 | 3 |
| As | 10 | 10 | 10 | 10 | 10 |
| Cu | 800 | 100 | 100 | 100 | 2000 |
| Zn | 400 | 100 | 100 | 100 | 3000 |
| Cr | 20 | 100 | 20 | 100 | 50 |
| Mn | 100 | 700 | 100 | 700 | 400 |
| Fe | 570 | 850 | 2000 | 850 | 300 |
| CN− | 10 | 10 | 10 | 10 | 70 |