Central Water Commission (CWC) under Ministry of Water Resources monitors water quality at the key locations covering all the major river basins of the country. It has a three-tier laboratory system for analysis of the parameters for monitoring.The Level – I laboratories are located at 258 field water quality-monitoring stations on major rivers of India. The physical parameters such as temperature, colour, odour, specific conductivity, total dissolved solids, pH and dissolved oxygen of river water are observed in these laboratories.
The Level-II laboratories located at 24 selected divisional headquarters to analyse 25 physico-chemical characteristics and bacteriological parameters of the river water. The Level–III/II+ laboratories are located at 4 places namely Varanasi, Delhi, Hyderabad and Coimbatore. 41 parameters including heavy elements/toxic parameters and pesticides are analysed periodically in these laboratories.
CWC computerizes the data generated in the Data base system and disseminates in the form of Hydrological Year Book and Status Reports. Water Quality yearbooks are published and water quality bulletins also issued regularly.