The aim of this study is to illustrate the parameters determined at certain stages according to the project milestones by using GIS procedures in order to visualize the monitored chemical parameters of the Danube River between the Black Sea coast and Km 175 on the Danube River. This study will only focus on a small segment of the Danube River which is Km 175 in the upstream of Braila city and nautical mile 67 downstream from Reni city for the following chemical parameters: chlorophyll, total phosphorus, orthophosphate phosphorus (P -PO4), ammonium nitrogen (N-NH4), nitrite nitrogen (N-NO2), nitrate nitrogen (N-NO3), organic nitrogen and total nitrogen. By choosing the right color shader in order to be easily understood, the visual representation of the water quality can improve the population, authorities and stakeholder’s perception. GIS nowadays is a very efficient tool in supporting the decision-making process. The authorities often rely on this tool and on the experts that develop map products of any kind in order to understand the scientific terms and language through a visualizing environment. Acknowledgement: The study was performed in the frame of the project BSB 27-MONITOX.