Results of assessment of raw sewage sludge, vermicompost and earthworms from Waste Water Treatment Plant in Kluczbork are presented in this paper. Vermicomposting process improved sewage sludge from greasy to soily structure. It affected the level of organic matter, total N, Na, Cd, Zn during the process. The Cr and Cd contents remained at the same level. However, the increase of the level of dry matter, and the content of P, K, Ca, Mg, Pb, Cu was observed. Heavy metals cumulating in earthworms depended on the type of metal and their content in some cases (Cd, Pb, Ni) was higher than in vermicompost.