A study was conducted to evaluate the effect of artificial groundwater recharge of surface runoff on groundwater quality. Two injection wells were installed at the selected sites. At site-1, a bore of diameter 152.4mm was drilled till the depth of 13.72m from the bottom of a water storage tank. In this bore a strainer (slotted pipe) of length 4.57m and diameter 102mm was installed below the water table and the rest upper portion was joined by casing pipe of length 6.10 m and diameter 102mm. At site-2, a bore of diameter 152.4mm was drilled till the depth of 7.32m from the bottom of a water storage cum intake tank. A strainer of length 4.57 in and diameter 102mm was installed above the water table. EC, pH, sodium and potassium concentrations in groundwater were determined using appropriate instruments and methods. Bacterial density in water sample was determined by serial dilution in multiple tubes using fermentation technique. Following presumptive testing for total Coliform using Lauryl Mackenky.Broth of single and double strength were used and results were reported as Most Probable Number (MPN). The laboratorial study of pre and post recharge groundwater samples has shown considerable change in chemical and biological qualities. The EC and pH decreased at both the sites. The post recharge Na and K concentrations decreased at site-1 but increased at site-2. Similarly MPN (No.100ml) and COD (ppm) tor site-1 and site-2 were 26, 65 and 110 and 175, respectively, whereas for pre-recharge water samples corresponding values were 0 and 10.
