What are the different ways in which water gets contaminated?

Dear Student

Water gets contaminated by the following ways:
(i) Many industries discharge harmful chemicals to rivers and streams.
(ii) Water gets contaminated when sewage is disposed off in rivers.
(iii) Pesticides, weedecides and other chemicals also dissolve in water and get contaminated.
(iv) Breeding of microorganisms makes water polluted.

​Thanks