The concentration of hydrocarbons in the yield of dry matter in ryegrass depended upon the sludge dose. The highest concentrations of hydrocarbons in ryegrass were found in a control object. In objects fertilized with waste activated sludge the highest concentration of hydrocarbons was found in ryegrass with 20% ofwaste activated sludge. After a two-year experiment, the highest concentration of hydrocarbons was found in the control object. In soil materials fertilized with waste activated sludge the concentration of hydrocarbons grew along with the sludge dose.