E Fataei - Department of Environmental Engineering, Islamic Azad University, Ardabil Branch, Ardabil, Iran

Pars Abad City is located in the north of Ardabil province in Iran. Because of importance of water canal to provide water for city and agriculture in this area, this investigation is prepared. This investigates water quality changes and sources of pollutant and the decrease water quality to control the factors involved. The quality of the river water is affected in two ways: first from Aras River as supplier of canal water. This river passes from Turkey, Armenia and Azerbaijan countries and get pollutants in that basin from different urban and rural areas as well as industrial and agricultural pollutants which contribute to the pollution of this river, second it is polluted from residential and the agriculture runoff from cultivated areas around the canal. This study is based upon data of 2008 from 5 sampling stations along the Mil and Moghan dam and drinking water treatment of Pars Abad city. The results show that upstream stations have good quality but downstream have low quality. The canal in this area was categorized by quality. The findings indicated that the region is clearly suffering from environmental pollution which can be classified into four main zones with all measurement parameters and classified into three main zones with microbiological parameters

Qualitative, Pollution Sources, Water Canal, Drinking Water Treatment, Pars Abad City