Water is the mother liquor of all forms of life and it is also solvent, various kinds of atoms and particles etc are also dissolved in the water. In water the bacteria, viruses, protozoan etc. are also developed, and these are also making polluted water. The water is polluted by various kinds of harmful waste materials & particles. Both type of pollutants either biotic pollutants (bacteria, Viruses, fungi, protozoan, etc.) or abiotic pollutants create various kinds of diseases in the digestive system of human beings. This study recommends that awareness about cleaning of surrounding and not only water, but also cleaning of air, land etc. to protect the water against the agents of pollution. It is also essential that the study of water & water pollution with the study of human digestive system.