Water pollution and dwindling water supplies severely strain the environment. Rapid urbanization, more intensive agricultural practices, and the uncontrolled release of geothermal water all contribute to this problem with water quality. The natural composition of waters is most likely to be altered by human activity. The amount of freshwater in the river has decreased as a result of extensive mining for chlorine in the Shatt Al-Arab River. Determining the surface water quality standards in the river basin was the primary goal of this study, given the rising urban water demand and the associated environmental and health risks linked to pollution. The method of the Nemerow pollution index was used to assess the water quality. The all-encompassing pollution index is used by the Nemerow pollution index method to determine the water quality category, which highlights the most polluting factor while also accounting for the assessment system's other components' contributions. The study's findings show that, over the course of the study, the monitoring indicators of the monitoring stations have attained the "Surface Water Environmental Quality Standard" Category V water quality standard and above. Because the NPI method incorporates the effects of various impacting factors, the water quality was categorized into a grade of more reasonable.