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The purpose of this paper is to assess the philosophical categorical meaning of the concepts of “ecological state” and “environmental security” in the space and time of zones of influence of a water management facility, hereinafter referred to as the “Object of Activity” as part of the natural technical system “Natural Environment-Object of Activity-Population”, related to the use of water resources in a particular branch of economic activity. It should be noted that the concept of the “ecological state” in the considered space and time of the river basin geosystem, where quantitative and qualitative indicators of water resources are formed, determines the most important factor in the life of the “Population” living in the zones of influence of the “Object of Activity” – “environmental security”. The formation of scientific thinking in the field of the use of water resources in various branches of economic activity determined the creation and development of a class of natural and technical systems, in which the central technogenic component is different types of hydraulic structures, making certain changes in the natural processes of relationship, interaction and interrelation of biotic and abiotic elements among themselves as part of the “Natural Environment” and the life of the “Population”, forming an “ecological state” as a factor of “environmental security. The systemic concepts of “ecological state” and “environmental security” are the most important basis in the scientific assessment of the level of technogenic impact of the “Object of Activity” on “Natural Environments” within the spatial limits of basin geosystems when making practical decisions.

Based on the results of experimental studies of the cyanobacteria and toxins properties, produced byblue-green algae, was assessed the quality of drinking water according to organoleptic characteristics in the area of the Lower Don geosystem. Experimental data on the properties of cyanobacteria and toxinsproduced by blue-green algae are presented in this study. Based on the results of research at the pilotplant, the basics of drinking water purification technology in the water dipper from blue-green algae have been developed, which to some extent helps to increase the environmental safety of drinking water in urban systems and settlements.

Based on the results of monitoring studies of existing and under construction water management facilities within the basin geosystems of the Kuban, Lower Don and Terek river, using a systematic approachof developing methodological framework for assessing environmental safety in space and time on the model of the system “OP-SES-PM”, in which the vector properties are determined by the structure of this system. Taking the water management facility as a source of environmental safety, the concept of environmental safety is defined. Which is interconnected with the ecological state of the water managementfacility, considered as an “object of activity, as part of the environmental-technical system” “Natural environment-Object of activity-Population”. Based on the analysis of the processes of interaction between the components of the system “OP-SESPM” conceptual statements ofenvironmental safety have been formulated