Surveying drinking water quality (Balikhlou River, Ardabil Province, Iran)

Considering the importance of Balikhlou River as one of the most important water sources of Ardabil, Nir and Sarein cities, maintaining water quality of this river is the most important goals in provincial and national levels. This river includes a wide area that provides agricultural, industrial and drinking water for the residents. Thus, surveying the quality of this river is important in planning and managing of region. This study examined the quality of river through eight physicochemical parameters (SO 4 , No 3 , BOD 5 , TDS, turbidity, pH, EC, COD) in two high- and low-water seasons by international and national standards in 2013. For this purpose, a review along the river has been done in five stations using t test and SPSS software. Model results showed that the amount difference in TDS and EC with WHO standards, and TDS rates with Iran standards in low-water seasons, pH and EC with WHO standards in high-water seasons, is not significant in high-water season; but for pH and SO 4 parameters, turbidity and NO 3 in both standards and EC value with WHO standard in low-water season and pH, EC, SO 4 parameters and turbidity and NO 3 in high-water season have significant difference from 5 to 1%, this shows the ideal limit and lowness of parameters for different usage.