Question raised in Lok Sabha on Common Effluent Treatment Plants, 29/11/2016. According to Central Pollution Control Board, 193 Common Effluent Treatment Plants (CETPs) are installed in the country with combined capacity of 1474 Million Litres per Day (MLD) which is given at Annexure – I. There are 920 Sewage Treatment Plants (STPs) in different States/UTs including Tamil Nadu and West Bengal out of which, 615 STPs are operational, 80 STPs are non-operational, 154 STPs are under construction and 71 STPs are under planning stage. The details of the STPs are given at Annexure – II.