Water is vital for all aspects of human and ecosystem survival and health .Thus, its quality is also important. Water quality refers to the composition of water samples because, their high concentration make the water unsuitable for drinking purpose. Present study reports the concentration of ions such as Calcium, Magnesium, Sodium, Potassium, Chloride, Phosphate and Sulphate from Siddheshwar reservoir, Hingoli district of Maharashtra state. The analysis has been carried out during June 2009 to May 2010. Water of this dam is mostly useful for drinking, domestic, agricultural, aquaculture, and industrial purposes. The observed values were compared with standard permissible limit as prescribed by various organizations.