Fuzzy Evaluation of groundwater for drinking purpose in Tehran Province

Water quality management is a global important issue. In this study, the application of Fuzzy Set Theory is used to evaluate groundwater quality for drinking purposes. Fuzzy Synthetic Evaluation model gives the certainty levels for the acceptability of the drinking water based on the prescribed limit of various regulatory bodies’ quality class and perception of the experts. In this research, 10 groundwater parameters from 176 well samples measured from 2009 to 2010 in Tehran province, Iran. Using Fuzzy Water Quality Model, the groundwater quality classified in three, desirable, acceptable, and unacceptable categories. Results showed only 132 from 176 samples came in desirable class certainty level of 57.4 to 76.3 percent. About 15 samples classified in the acceptable category whose certainty level ranged from 33 to 60.2 percent and the remaining 13 samples classified in not acceptable category with the maximum certainty level of 24 percent.