In arid to semi-arid regions of the world groundwater is the only source for domestic, irrigation and industrial utilisation. In south-western part of Haryana groundwater is the main source for drinking purpose. In the present study groundwater quality has been assessed for drinking purpose in Adampur block in Hisar district of Haryana. In the study area 23 groundwater samples were collected from different locations. Groundwater samples were analysed for chemical parameters of groundwater quality. BIS 10500:2012 drinking water standards were used to assess the suitability of groundwater for drinking purpose. In the study area pH of groundwater samples ranges 6.84 to 8.5 which is desirable, TDS ranges 130 mg/l - 4119 mg/l and desirable at Siswal (130 mg/l), Chuli Kalan (160 mg/l), Mahalsara (260 mg/l), Kabrel (485 mg/l), permissible at Daroli (1440 mg/l), Modakheda (1895 mg/l), Bhodia Kheda (1290 mg/l), Kalirawan (1477 mg/l), Asrawan (1416 mg/l), Adampur Town 3 (1495 mg/l) and non-potable at Near Daroli Minor (3035 mg/l), Dhani Mohbattpur (4445 mg/l), Adampur Town 1 (2019 mg/l), Sadalpur (3539 mg/l), Chibarwal (3773 mg/l), Khairmpur (4082 mg/l), Mothsra (2017 mg/l), Ladwi (4119 mg/l), Kohli (3880 mg/l), Adampur Town 2 (2850 mg/l), Ghudsal (2004 mg/l), Bagla (2019 mg/l). In the study area calcium ranges 2.47 mg/l - 57 mg/l which is desriable in all the groundwater samples. Magnesium ranges 1.2 mg/l - 26.6 mg/l and desirable in all the groundwater samples. Sodium ranges 8.9 mg/l - 80 mg/l and desirable in all the groundwater samples except permssible in groundwater samples at Near Daroli Minor (51.50 mg/l), Dhani Mohbattpur (61.60 mg/l), Chibarwal (74.60 mg/l), Khairmpur (67.60 mg/l), Ladwi (80 mg/l), Kohli (55.90 mg/l). Potassium ranges 2 mg/l - 14.3 mg/l and desiarble in all the groundwater samples except Bhodia Kheda (14.30 mg/l), Adampur Town 3 (13.5 mg/l), Bagla (12.90 mg/l) in which it is non-potabe. Carbonate ranges nil to 0.2 mg/l. In the study area carbonate is desirable in all the groundwater samples. Bicarbonate ranges 15 mg/l - 140 mg/l and desirable in all the groundwater samples. Chloride ranges 1.5 mg/l - 88 mg/l which is desirable in all the groundwater samples. Zinc ranges 0.002 mg/l - 0.33 mg/l and desirable in all the groundwater samples. Iron ranges nil to 0.007 mg/l and desirable in all the groundwater samples.The study is highly useful for planning groundwater for drinking purposes in the study area.