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This paper aims to assess water quality of Danube River in Serbia for 2010.  Two methodologies were applied for this purpose: Serbian Water Quality Index  (SWQI) and Canadian Water Quality Index (CWQI). WQI value is dimensionless,  single number ranging from 0 to 100 (best quality) derived from numerous  physical, chemical, biological and microbiological parameters. SWQI was  mainly good and very good. This methodology includes parameters for  assessment of organic loading, but does not involve parameters of heavy  metals concentration. For that purpose CWQI was used. Besides overall, CWQI  was calculated for following uses: aquatic habitat, drinking, recreation,  irrigation and livestock. Overall CWQI was marginal and fair, which was  equivalent with poor and good SWQI. CWQI methodology showed increased  concentration of copper in all cases which affected overall water quality and  aquatic habitat while increased turbidity in many cases had negative  influence on drinking water. Differences between SWQI and CWQI resulted from  different methodology: different methods of calculation and parameters. In  order to get more comparable results it is necessary to develop unique WQI  methodology. [Projekat Ministarstva nauke Republike Srbije, br. 47007

Serbian and Canadian water quality index of Danube river in Serbia in 2010