Document Type : ORIGINAL RESEARCH PAPER
Department of Environmental Science, Faculty of Natural Recourses and Environment, Science and Research branch, Islamic Azad University, Tehran, Iran
Department of Water Engineering and Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran
Microbiological and chemical sampling of drinking water wells in Mohammad Shahr, Meshkin Dasht and Mahdasht of Karaj was carried out. Water quality parameters were analyzed using GIS software. The results showed that the reason for the increase of sulfate could be attribution of acidic atmospheric precipitation and sulfate fertilizers. The level of magnesium in groundwater is less than the standard level. It is predicted that the reason for the relative increase of its concentration in parts of the region is related to the geological structure of that area. The unexpected rise of chloride in some wells has been observed due to geo-electric studies carried out in the region due to the presence of evaporate sediments and the influence of urban and rural post-water pollution and fossil waters. The results of measurement of nitrate and fluoride in the wells showed that the nitrate content is less than the standard values. The highest and lowest nitrate levels were found to be 35 mg / L and 4 mg / L, respectively. It was also observed that nitrate content in the measured seasons did not change much. This is due to the provision of drinking water from the groundwater resources, which are almost in constant quality. In the case of fluoride, the highest and lowest amount was 0.79 and 0.0 mg / L. Therefore, it is essential for the Alborz province water and wastewater company to install Fluorination machines on the distribution system.