Water Quality Indices – A Comparative Review

IJEP 41(10): 1182-1188 : Vol. 41 Issue. 10 (October 2021)

Sutapa Ray*

Govt. General Degree College, Keshiary – 721 135, West Bengal, India


Water pollution is one of the major challenges in front of human civilization. Scarcity of drinkable water is raising its highest peak. Observing the alarming situation, United Nations declared access to drinkable water as a fundamental right of every world citizen [1]. This situation excels the research in water quality, water characterization and water treatment. Not only the anthropogenic sources are causing water pollution but also the natural sources are polluting water. Thus many of the lakes and seas are polluted by natural sources and thus does not provide drinkable water. Considering this, researchers are concentrated on characterizing the water quality, depending on its suitability to drink or dispose of to a certain source. Drinkable water standards are established based on human health requirements, whereas, effluent water standards are established based on the ecology of the water body on which the effluent waters are being discharged. This paper reports a review of the water quality indices (WQIs) developed by different researchers and their comparative evaluation for some case studies.


Water, Quality index, Effluent, Drinking, Pollution


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