The profitable use of sewage sludge in agriculture as fertilization, depend upon the content of chemicals as well as the pathogenic microorganisms. In our investigation was shown, that energetic willow don't favour adaptation of pathogenic microorganisms in ryzosphere. The sanitary investigation of soil samples shown, that bacteria from genera Salmonella, Shigella, Staphylococcus and other from family of Enterobacteriaceae as well as the parasites eggs of Ascarius, Trichuris and Toxacaria introduced to soil environment with sewage sludge are very quickly eliminated from soil. The dangerous parasites and pathogenic bacteria gone in investigated soil in period about 3 mounts.