This thesis explains the waste management system in general, at the level of the Republic of Croatia and Zadar County. The waste management center is represented by several interconnected, functionally connected facilities that serve for the mechanical-biological processing of waste, with the goal of disposing of the minimum amount of waste, while obtaining energy. The detailed functioning of such a system is explained on the example of the Waste Management Center "Biljane Donje", which represents a structural unit whose elements are explained in more detail in the paper. Based on the research work and laboratory tests, the parameters of the elements of the landfill for non-hazardous and inert waste were selected. According to the selected parameters, stability analyzes were carried out for landfills in situations without and with seismic loading. The stability check of the body of the disposed waste was carried out, to prevent a landslide or global collapse, and at the critical contact of the layers within the structure due to the check of stability against sliding. The stability analysis proved the stability of the landfill structure as well as the satisfactory values of the parameters of the elements used in the analysis.