A STUDY OF GROUND WATER QUALITY IN LENJAN TOWNSHIP OF ISFAHAN PROVINCE

Ground water is considered as a valuable resource for drinking, agricultural, and industrial uses. As human activities are known to affect water quality, studies of this source are necessary to maintain quality standards. Despite heavy agricultural and industrial activity in the Lenjanat region (Isfahan), there has been no evaluation of ground water quality in this area.In this research project, chemical parameters such as anions, cations and heavy metals were determined in 16 wells over four seasons. The yearly averages of the parameters calculated and displayed by the graphs.The results showed that "Lenjanat" ground water qualifies as very hard water. Most chemical parameters such as BOD, Cod: TDS, EC, S04 of wells number 1,2,3 and 14 exceed drinking water standards. The wastewater lagoons of the Isfahan Steel Mill may be polluting well No. 3 and the other three wells. Wells No.4 and 5, located in the lower areas of Munitions Factories, showed a ver's high COD.Due to the west-to-east direction of surface slopes (from munitions factories towards the above-mentioned wells) the water could be polluted by waste material from the industry. It seems that severe pollution of ground water exists around these factories and extensive studies are required to determine the type of organic and inorganic waste and the exact source of pollution in order to control groundwater quality.