Farhad Akhavan Limodehia - Environmental Engineering Department, Faculty of Environment, University of Tehran.
Maryam Masomi - Environmental Engineering Department, Faculty of Environment, University of Tehran
Amin Padash - Department of Industrial Ecology, Academic Center of Education, Culture and Research (ACECR), Tehran, Iran

The underground water pollution of metropolitan areas is one of the major problems of the big cities such as Tehran at present. The main reasons of underground water pollution are excessive population growth, sanitary wastewater of buildings and industrialdevelopment. However, in this study the Sulfateof 9 wells in district 7 of Tehran municipality were sampled and analyzed. Due to the results and compare to the standards, the zoning maps of the Sulfatepollution are prepared. In ARCGIS, an interpolation methodof Spline is used to produce the maps. Finally, two irrigation and surface water standards are used to show the states of Sulfatein the region7.

underground water; Sulfate; Interpolation; GIS; Tehran