The purpose of this study was to assess the impact of 24 water parameters, measured semi-annually between 2011 and 2013 in Coruh Basin (Turkey), based on the quality of the water. The study utilised analysis of variance (ANOVA), principal component analysis (PCA) and factor analysis (FA) methods. The water-quality data was obtained from a total of four sites by the 26th Regional Directorate of the State Hydraulic Works (DSI). ANOVA was carried out to identify the differences between the parameters at the different measuring sites. The variables were classified using factor analysis, and at the end of the ANOVA test, it was established that there was a statistically significant difference between the downstream and upstream waste waters released by the Black Sea copper companies and between the Murgul and Borcka Dams, in terms of water quality, while no statistically significant difference was observed between the Murgul and Borcka Dams. It was determined through factor analysis that five factors explained 81.3% of the total variance. It was concluded that domestic, industrial and agricultural activities, in combination with physicochemical properties, were factors affecting the quality of the water in the Coruh Basin.
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