Name two diseases caused by

(a) Infectious agents in polluted water,

(b) Toxic chemicals in polluted water.

(a) Cholera, typhoid and diarrhea are diseases caused by drinking water polluted with infectious agents like bactetria, viruses and protozoans.

(b) Cancer, arsenicosis and fluorosis are diseases caused by drinking water polluted with toxic chemicals like MTBE, arsenic and fluoride.