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Abstract-
To assess the seasonal variation of quality of groundwater of two adjoining towns of the hill state, Himachal Pradesh in the north of India, a study has been carried out. The specific study zone covering an area of about 120 sq. km. was selected near the industrial townships of Nalagarh and Baddi in district Solan. A total of 25 and 40 groundwater samples were collected, from 65 different locations during post-monsoon season of 2011 and pre and post-monsoon seasons of 2012. The overall residual sodium carbonate (RSC) of groundwater was ranged from -7.794 to 1.673 and -7.857 to 1.953 at Nalagarh and Baddi industrial areas respectively. The overall averaged residual sodium carbonate value at Nalagarh and Baddi industrial areas were less than 1.25, hence suitable for agriculture purposes. The findings also suggest that values of residual sodium carbonate of groundwater were far below the recommended standard value. Therefore it is suggested that regular attention should be given to the agricultural authorities, policy and decision makers to both the areas for better agriculture production. However, proper treatment of effluents from urban and industrial areas is highly desirable to maintain the residual sodium carbonate of groundwater in such areas to check further deterioration.