This document was prepared by the Central Pollution Control Board in its report entitled 'Scheme for Zoning and Classification of Indian Rivers, Estuaries and Coastal Waters' (ADSORBS/3/1978/-79). The Central Board classified the inland surface waters into five categories (A to E) on the basis of designated-best-use. The principal concern here is the end use to which the water may be put to by man.
The classification has been made in such a way that the water quality requirement becomes progressively lower from A to E. Besides, the water quality of any one of the five categories also satisfies the requirements of categories lower than the chosen one.
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