The rapid increase in thepopulation of our country, the growing agricultural, industrial, and miningactivities in recent years and the necessity to meet the needs of the growingpopulation increase the demand for water rapidly. The increase in the need forwater requires monitoring and control of surface clean water resources, whichare limited, and determining priority water policies. For this reason, not onlythe water quality but also the amount of water resources is important. In thisstudy, some heavy and metal determinations (As, Cu, Co, Ni, Cd, Cr, Mn, Pb)were performed in the major surface waters (Kezer, Başur, Bitlis, Botan and Zarovarivers ) in Siirt region and seasonal changes were investigated. As a result,the levels of the heavy metals determined were below the values determined byWHO (World Healt Organization ), EPA (Environmental Protection Agency), TSE (Turkısh Standarts Instite ) and there was no change in their levels seasonally.