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Background & Aims of the Study: Drinking polluted water can transmit diseases, so potable water treatment is one of the most challenging and complex systems in countries. Continuous monitoring for evaluation process in water treatment plant is important. This study aims to investigate performance evaluation of Qom water treatment plant to remove turbidity and coliform in 2005 - 2014.

Materials and Methods: In this cross-sectional descriptive study, daily results of experiments for coliform and turbidity parameters were collected in 2005 to 2014. Testing method is reported according to standard method. Statistical approaches were done using SPSS. Moreover, results of output water tests were compared with Iranian National standards.

Results: Range of turbidity level in raw water is observed from 1.05-253 NTU. Output turbidity values were less than the standard in all days. The annual average of turbidity and MPN in raw water for ten years were 7.495 NTU and 19.06 respectively. Maximum annual average of turbidity was between 2005 and 2006. Output turbidity values were less than Iranian National standard in all days.

Conclusions: Performance of Qom water treatment plant to remove turbidity and coliforms from water corresponds with Iranian National Standard. Because of desert climate of Qom and also probable creating flood conditions in some seasons, creating fluctuations in incoming water to the plant is possible, that shows the importance of preparedness treatment processes to deal with such critical situations. Studies in field of evaluation water treatment can improve performance processes and possible errors in treatment units