What is water pollution ?

Explanation

Water Pollution. It is the degradation of quality of water due to addition of substances (inorganic, organic, biological, radiological), factors (e.g., heat) and deprivation that makes it health hazard, unfit for human use and growth of aquatic biota. Water pollutants belong to three categories, biological, chemical and physical, (i) Biological. Various pathogens, e.g., viruses, bacteria, protozoa, helminthes, algae.(ii) Chemical. Organic wastes, organic biocides (e.g., DDT, BHC) and poly chlorinated biphenyls (PCBs), inorganic chemicals like As, Pb, Cd, Ni, Hg, phosphates, nitrates, fluorides, etc. (iii) Physical. Hot water, oil spills.