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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 percent sodium (%Na) of groundwater was ranged from 5.715-27.869 and 5.064-26.992 at Nalagarh and Baddi industrial areas respectively. The overall averaged percent sodium value at Nalagarh and Baddi industrial areas were less than 100, hence suitable for agriculture purposes. The findings also suggest that most of the values of percent sodium of groundwater were far below the recommended standard values. However, proper treatment of effluents from urban and industrial areas is desirable to maintain the %Na of groundwater of the study areas to check further deterioration.