Question

what is water pollution write four main causes of pollution in the river ganga

Answer 1

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Water pollution is the contamination of water bodies. This form of environmental degradation occurs when pollutants are directly or indirectly discharged into water bodies without adequate treatment to remove harmful compounds. 

Causes of Water Pollution. Water pollutionis caused due to several reasons. Here are the few major causes of water pollution: Sewage And Waste Water: Sewage, garbage and liquid waste of households, agricultural lands and factories are discharged into lakes and rivers.

Answer 2

pollution is when contaminants are introduced into the environment due to natural or artificially caused man-made reasons.

the main causes of pollution in river Ganga are:
increase in population 
3 billion litres of raw sewage gets dumped in it on a daily basis 
it is 1/3rd of the total wastewater of India