The last centuries, and especially the last decades, have proved to be very effective in terms of environmental pollution due to industrialization. Heavy metals that fall on the daytime surface as a result of such activities, migrating within its limits to the bases of erosion – water bodies often create an undesirably high concentration of them for biota in the broad sense of the term. Various natural and man-made objects in the monitoring mode are considered – these are farmlands during abnormal spring floods and water bodies during the period of open water surface. During the work, pseudo-closed and open natural and man-made systems were considered. Seasonal variants of secondary pollution of the water column and the factors determining it are presented