(i) Discharge of raw sewage into water bodies.
(ii) Abuse of water bodies by human beings.
(iii) Natural causes for example, soil erosion.
(iv) Discharge of industrial waste/ radioactive waste into water bodies/ oil spillage.
(v) Disposal of domestic waste into water bodies.
(vi) Discharge of agriculture chemicals into rivers/ lakes by rain water.
maurice.mutuku answered the question on July 1, 2017 at 08:31
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