Background & Aims : Water Quality Indices are one of the methods can be used in water quality management as a useful tool in decision making, so this study carried out on evaluating the quality of the Aydughmush river by National Sanitation Foundation Water quality (NSFWQI) and River Pollution Indices (Liou).

  Materials & Methods : In this cross sectional study standard field parameters including dissolved oxygen, temperature, Biochemical and chemical oxygen Demand, Most Probable Number of Coliforms, Fecal Coliform, Turbidity, Total Dissolved Solids, Total Solids, pH, conductivity and others were measured at eight different stations during one year (2010 to 2011). Sampling points were selected on the basis of their importance. From the water quality (WQI) the National Sanitation Foundation Water quality (NSFWQI) and from River Pollution Indices (Liou) that defined by Liou, were used for Aydughmush River water quality survey.

  Results : As results showed most of the water samples were found within Moderate category of National Sanitation Foundation Water Quality Index (NSF-WQI) and Good category base on Liou results.

  Conclusion : As results of numerical values ​​of Liou index showed, Station B had been polluted due to the high amount of biochemical oxygen demand and low dissolved oxygen levels. As this study showed using Liou is the same as NSFWQI with difference of their parameters and calculation method but they have same value in decision making.

  SOURCE: URMIA MED J 2013: 24(2): 164 ISSN: 1027-3727