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Drinking water contaminants and maximum admissible limit by different international organizations.
| Heavy metals (µg/L) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Cr | Mn | Co | Ni | Cu | Zn | As | Cd | Pb | |
| US-EPA (2008) | 100 | 50 | 100 | 100 | 1300 | 5000 | 10 | 5 | 15 |
| WHO (2008) | 50 | 400 | aNM | 70 | 2000 | NGLb | 10 | 3 | 10 |
aNM: not mentioned.
bNGL: no guideline, because it occurs in drinking water at concentrations well below those at which toxic effects may occur.
