Why Ganga is so polluted?

CPCB on 01 May, 2022

   Thirty-six settlements, classified as Class-I cities, contribute 96 per cent of wastewater              draining into the river. According to CPCB’s 2013 report, 2,723 million litres per day (mld) of  domestic sewage is discharged by cities located along the river. But even this may be  a gross underestimate as the calculation is based on the water that is supplied in the cities. As city managers often do not supply all the water that is used—much is groundwater—the actual sewage is often higher. This is what CPCB found when it measured the discharge from drains into the Ganga—6,000 mld was discharged into the river (see ‘State of pollution’).

Needless to say, the capacity to treat this sewage is inadequate. But it is even smaller, if we consider two facts: one, that the gap between sewage generation and treatment remains the same every year—55 per cent. So even as the treatment capacity is added, more sewage gets added because of                population growth. The situation worsens if the actual measured discharge from drains is taken to        estimate the pollution load. Then the gap between what is installed and what is generated goes up to 80 per cent.