The cadmium, lead and mercury levels were determined in five dried plant materials: Herba Chelidonii, Fols Sambuci, Folium Plantaginis lanceokitae, Folium Plantaginis maioris i Folium Urticae collected irom three sites differing in heavy metal impact as well as in commercial brands of the materials and their decoctions. An attempt has been made to at least rough localization of the metals in the materials and their elimination by washing fresh plants with water.