Lubuk Siam Lake is a Lake that gets runoff flooding from Kampar River. This Study Aims to determine teh content of Pb heavy metal be found in water, sediment, gilss and heart of baung fish (Hemibagrus nemurus) in Lubuk Siam Lake Siak Hulu Subdistrict. Pb heavy metal content was tested using Atomic Absorption Spectometry (AAS) heavy metal analyzer. Pb content of heavy metal that accumulates in w…