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Thus, the objective of this study was to evaluate the spatiotemporal evolution of water quality in the Apodi-Mossor\u00f3 River, in the urban section of Mossor\u00f3-RN, during the dry and rainy seasons. To this end, the physical\u2013chemical and microbiological attributes of water samples collected at six points along the urban stretch of the Apodi-Mossor\u00f3 River were characterized. Using the water quality data, the Water Quality Index was calculated, and multivariate statistical analysis was performed. The Water Quality Index varied considerably. At the Gen\u00e9sio Dam, a more positive assessment was observed, with ratings ranging from excellent to good. However, the other points showed significant variations, especially the Barrocas Dam, which received all ratings. The attributes that most influenced the results were total Kjeldahl nitrogen, turbidity and biochemical oxygen demand. 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