This paper presents the measurement results of physicochemical parameters and heavy metal concentrations for Topalyurdu Dam, Sivas-Turkey. In total, 21 physicochemical parameters and 7 heavy metals were investigated for water quality assessment of the studied pond between November 2015 and December 2016. Temperature, pH, salinity and electrical conductivity parameters were obtained from the field using a multi parameter. The analyses of nitrite, nitrate, ammoniac, ammonium nitrogen (NH4+), chloride, phosphate, sulphate, sulphite, potassium, calcium, sodium and magnesium were conducted by using HACH LANGE brand DR 6000 laboratory type spectrophotometer, and the analyses of the heavy metals were conducted by using a gas Chromatography-Mass Spectrometry. It has been found that the lagoon shows I-III class water characteristic according to Surface Water Quality Management Regulation (SWQMR). The results of this study provide a data baseline for future studies on subsequent evaluations of possible future environmental contamination, and this study is also the baseline data for future ecological studies, and conservation and management of the resources of Sivas-Turkey.