Classification of surface waters on the basis of best-
designated use is carried out after assessing the existing water quality. This is an important tool for the effective management of the environment and for pollution control. The Central Pollution Control Board has laid down guidelines to be followed for this classification. This Board is implementing a continuous program to classify the surface waters of Kerala after assessing the water quality. Classification of 12 rivers has been completed and more rivers have now been taken up for classification.