The present study examined the quality of groundwater in 83263 ha region comprising Dabwali block of Sirsa district, lies on the western part of Haryana state. One hundred and twelve groundwater samples from running tubewells in the block were analyzed for ionic concentrations of CO32-, HCO3-, Cl- SO42-, Ca2+, Mg2+, Na+ and K+. Parameters such as electrical conductance (EC), pH, sodium absorption ratio (SAR) and residual sodium carbonate (RSC) were also evaluated. In the block, EC ranged from 0.4-13.9 dS/m with an average of 4.0 dS/m and pH ranged from 7.4 to 10.0 with an average of 8.4. SAR ranged from 0.9 to 20.8 (m mol/l)1/2 with an average of 8.7 (m mol/l)1/2 and RSC ranged from 0.0 to 3.6 and it was absent in all samples having EC greater than 3 dS/m. According to AICRP classification, out of seven categories, maximum 31.3% of samples were found in marginally saline and minimum 8.0% were found in saline, whereas no sample was found in alkali and high alkali categories. Contour maps of EC, SAR, RSC and groundwater quality were plotted to study spatial variability of these parameters in the block. The most dominating range of EC of groundwater was 2-4 dS/m, lying in eastern to western parts of the block and for pH, it was 8.0-8.4. On the basis of GIS mapping, the maximum area (33555 ha) was estimated under marginally saline category which comprised 40.3% area of the block followed by high SAR saline category with estimated area of 24646 ha and the minimum area (3913 ha) of the block was estimated under saline category. As GIS works on the principle of spatial distribution, thus, it depicted the true picture of groundwater quality distribution in an area.