This paper presents the criteria and applied methods in the screening of potential sites for the wastewater treatment plant of the Falavarjan district, northwest of Esfahan province. Among For this, the nine parameters which were selected as main criteria, 7 parameters were considered to define the buffer zones in the natural and artificial terrain. At the first stage of study, unsuitable zones were excluded and the weights of main and subclasses were calculated using AHP method. Then, each parameter was mapped into a GIS system as individual data layer. The final susceptibility map which produced by overlapping all data layers was divided into 4 categories. Then, the three top ranked areas were selected from the very suitable class. In order to locate the site with the minimum affection on the environment, Leopold Matrix was used to assess the environmental impacts. Finally, area 1was selected through both TOPSIS and EIA as the most preferable option for the construction of the wastewater treatment plant.

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