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This paper presents the efficient modifications in calculating formula of water quality index. Water quality index provides us a single number which expresses overall water quality at a certain location and time which is based on several quality parameters. The objective of an index is to turn complex water quality data into information that is understandable and usable by the public. In this paper a formula will be found to calculate water quality index when the numerical value of some of it'sdoi:10.15623/ijret.2013.0204035 fatcat:fmgsujavcrezzkfib6wcoy2x2q