Groundwater is the most important source of water in arid and semi-Arid regions of India and its quality plays an important role to plan the proper irrigation strategy. Thus, a study was carried out for the quality appraisal of the groundwater of Ellenabad block (58924 ha) of district Sirsa, Haryana. One hundred and seventeen groundwater samples from running tubewells in the block have been analyzed for ionic concentrations of C032", HC03\ CI', S042", Ca2+, Mg2+, Na+ and K+. Parameters such as electrical conductance (EC), pH, sodium absorption ratio (SAR) and residual sodium carbonate (RSC) have also been evaluated. In the block, EC ranged from 0.3 to 8.7 dS/m with an average of 2.7 dS/m and pH ranged from 7.2 to 9.0 with an average of 8.4. SAR ranged from 0.7 to 21.9 (m mol/1)1'2 with an average of 7.2 (m mol/l)1/2and RSC ranged from 0.0 to 3.6 and it was absent in all samples having EC greater than 2 dS/m. According to AICRP criteria, out of seven categories, maximum 44.4% of samples were found in good and minimum 6.8% were found in saline as well as in marginally alkali categories. Contour maps of EC, SAR, RSC and groundwater quality plotted to study spatial variability of these parameters in the block. The most dominating range of EC of groundwater was 0-2 dS/m, lying in central part of the block and for pH, it was 8.4-8.8. On the basis of GIS mapping, the maximum area (25462 ha) was estimated under good category which comprised 43.2% area of the block.