Water quality indices play an indispensable role in the holistic approach of managing water resources; it gives a straightforward interpretation of the vast range of water quality tests’ results. In the present study, the Nemerow pollution index and the Canadian water quality index were applied to analyze the spatial and temporal fluctuation of Tigris River’s water quality within Baghdad city (Nine observing stations were considered for a Six-year study period). Overall, a grade of slightly polluted/Marginal was attained; the seasonal analysis shown a decline in the water quality in winter and spring seasons. Beast water quality index values obtained at the Al-Karkh station in 2015 and were 3.51 (Grade C using Nemerow method) and 73.63 (Grade C using the Canadian method). Both Nemerow and the Canadian indices exhibited comparable results, producing a global trend of Tigris water quality deteriorates as it passes across the city. Among fifteen physicochemical parameters tested in this paper, the main water quality deterioration factors of the Tigris River were recognized to be: turbidity, iron, ammonia, sulfate, total dissolved solids, electrical conductivity, and alkalinity; where they exceeded permissible limits for drinking purpose, especially after Al-Karkh station during the study period.

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