30% sites have polluted water
Of the 222 sites monitored by the Central Water Commission for water quality between 2012-13 and 2016-17, water quality at 67 locations was beyond the permissible limits. Out of the 67 sites, 14 sites fell in category I (severely polluted) and 12 sites fell under category II. This excludes Ganga and Brahmaputra, the two most important and polluted river basin systems
What is Biochemical Oxygen Demand (BOD)
The amount of dissolved oxygen that must be present in water in order for microorganisms to decompose the organic matter in the water. It is a used as a measure of the degree of pollution. The BOD value is most commonly expressed in milligrams of oxygen consumed per litre (mg/L). If the BOD level is higher than 3mg/L, it is unfit for drinking
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