Schedule 1 CLASSIFICATION OF INLAND WATERS (DS1)
| (1) | (2) |
|---|---|
| Substance | Concentration in microgrammes per litre (annual mean) |
| Aldrin, Dieldrin, Endrin and Isodrin | (i) 0·03 for the four substances in total; (ii) 0·005 for endrin |
| Cadmium and its compounds | 5 (total cadmium: both soluble and insoluble forms) |
| Carbon tetrachloride | 12 |
| Chloroform | 12 |
| DDT (all isomers) | 0·025 |
| para-para-DDT | 0·01 |
| Hexachlorobenzene | 0·03 |
| Hexachlorobutadiene | 0·1 |
| Hexachlorocyclohexane (all isomers) | 0·1 |
| Mercury and its compounds | 1 (total mercury: both soluble and insoluble forms) |
| Pentachlorophenol and its compounds | 2 |