The tutorial covers issues related to water monitoring systems and assessment of anthropogenic impact on water bodies. The influence of hydrodynamic conditions on the distribution of pollutants, the tasks and principles of monitoring systems at the global and local levels, and comprehensive water quality assessments were studied. Mathematical models of water quality assessment and forecasting are presented. Additionally, information on biological monitoring of water bodies is highlighted. Meets the requirements of the Federal state educational standards of higher education of the latest generation. For University students studying in the areas of training 05.03.06 "Ecology and nature management", 18.03.02 "Energy and resource - saving processes in chemical technology, petrochemistry and biotechnology", 20.03.01 "Technosphere safety", 20.03.02 "nature management and water use".