en عمومى General مقاله اصیل Original Article <p>Background: This study aimed to evaluated trends for iron and manganese concentrations in wells, reservoirs, and water distribution networks in Qom city during the summer of 2012. Methods: This was a cross-sectional study. The studied scopes consisted of groundwater (60 wells), reservoirs (10 tanks), and water distribution network (33 points). One sample was taken from each source monthly. Statistical tests used included post hoc tests (Tukey HSD). Finally, the results were compared with drinking water standards. Results: The average concentrations of iron in groundwater, reservoirs, and distribution networks were 0.09, 0.07, and 0.07 mg/l, respectively. The average concentrations of manganese in groundwater, reservoirs, and distribution networks were 0.15, 0.09, and 0.1 mg/l, respectively. The turbidity averages in groundwater, reservoirs, and distribution networks were 0.58, 0.6, and 0.52 NTU, respectively. The average concentrations of free chlorine residual in water reservoirs and distribution networks were 1.74 and 1.06 mg/l, respectively. The pH averages in groundwater, reservoirs, and distribution networks were 7.4, 7.7, and 7.5, respectively. The amounts of iron, manganese, turbidity, free chlorine residual, and pH in the investigated resources had no significant differences (P > 0.05). Conclusion: The amounts of iron, manganese, turbidity, free chlorine residual and pH in groundwater, reservoirs, and water distribution networks of Qom are within permissible limits of national standards and EPA guidelines. Only the amount of manganese was higher than the Environmental Protection Agency (EPA) permissible limit.</p> Iron, Manganese, Drinking water, Qom 67 72 http://ehemj.com/browse.php?a_code=A-10-27-12&slc_lang=en&sid=1 Mohammad Fahiminia 10031947532846001873 10031947532846001873 No Environmental Health Engineering, Research Center for Environmental Pollutants, Qom University of Medical Sciences, Qom, Iran Hossein Jafari Mansoorian 10031947532846001874 10031947532846001874 No Environmental Health Engineering Research Center, Department of Environmental Health, Kerman University of Medical Sciences, Kerman, Iran Mohsen Ansari 10031947532846001875 10031947532846001875 No Environmental Health Engineering, School of Public Health, Qom University of Medical Sciences, Qom, Iran Ali Saifour Mofrad 10031947532846001876 10031947532846001876 No Environmental Health Engineering, School of Public Health, Qom University of Medical Sciences, Qom, Iran Gharib Majidi 10031947532846001877 10031947532846001877 Yes Environmental Health Engineering, School of Public Health, Qom University of Medical Sciences, Qom, Iran Reza Ansari Tadi 10031947532846001878 10031947532846001878 No Environmental Health Engineering, Urban Water & Wastewater Company of Qom Province, Qom, Iran Maryam Sadat Tabatabai Majd 10031947532846001879 10031947532846001879 No Faculty of Medicine, Islamic Azad University, Tehran Medical Branch, Tehran, Iran