The document discusses various sources of river pollution using the Ganges River as an example. It notes that over 1 billion liters of untreated sewage and industrial effluents enter the river daily. Other sources of pollution include partially cremated human corpses, agricultural runoff containing chemicals, and waste from the leather industry. The holy city of Varanasi has water in the Ganges River that is 120 times more contaminated than legally permitted levels. Bathing and other activities in the heavily polluted river put over 10 million people at risk of waterborne diseases every day.