The results of the distribution and specific activity of radionuclides in soils of the object of past environmental damage which is located in the segment of water disposal systems (landfill sludge). A certain characteristic similarity of the content in radium soils is 226, radium-228 as daughter products of thorium decay 228. Environmental risks of radionuclides entering the soil of the object of past environmental damage. The revealed activity of radionuclides makes it possible to assess this object of environmental damage as dangerous from the position of radioecology.