The west-flowing rivers Vaitarna, Patalganga, Ulhas, Balganga and their tributaries such as Tansa, Bhasta and Barvi are used as sources of drinking water.
NEERI scientists believe continued efforts by Maharashtra Pollution Control Board to take action against polluting industries will improve the quality further in the coming years.
Census figures point out that over 50 per cent of migration into the state was due to the availability of employment and business opportunitie at large.
The corporation has narrowed down on a consortium of Indo-French consultancy firm STUP Consultants Pvt Ltd and multinational consultants Ernst & Young.