Question raised in Lok Sabha on Identification of Polluted Rivers, 08/02/2019. The Central Pollution Control Board (CPCB) in association with the State Pollution Control Boards (SPCBs)/Pollution Control Committees (PCCs) monitors the water quality of rivers across the country, including Gangetic region, through a network of monitoring stations under the National Water Quality Monitoring Programme. As per the report published by CPCB in February 2015, 302 polluted river stretches have been identified on 275 rivers, spread over 28 States and 1 Union Territory, based on Bio-chemical Oxygen Demand (BOD) levels, a key indicator of organic pollution. The State-wise details of identified polluted river stretches are at Annexure-I. In the latest CPCB report of September 2018, 351 polluted river stretches have been identified on 323 rivers, spread over 29 States and 2 Union Territory, as per details given at Annexure-II.