How unclean is our valley How unclean is our valley ByNaveen MenezesNaveen Menezes / Updated: Jul 2, 2021, 06:00 IST BWSSB treats 260 mn litres of sewage a day but allows 431 MLD to flow into the Vrishabhavathi river. Can city’s SWDs be free of sewage by year-end as promised? Government agencies such as the Karnataka State Pollution Control Board (KSPCB) and the Bangalore Water Supply and Sewerage Board (BWSSB) seem to be the main culprits behind destroying the Vrishabhavathi valley as close to half of the sewage generated along the stretch continues to pollute what was a once a river. The BWSSB, which collects 20 per cent of the water bill charges as sewage cess, has been treating only 260 million litres per day (MLD) of sewage while 431 MLD sewage flows into the valley.