Rapid and unchecked growth of agricultural landuse in Punjab plain is a major source of contention in groundwater quality deterioration. This study is focused on the determination of groundwater vulnerability potential of vadose material using Geo-electrical method. Total of eight electrical resistivity soundings with schlumberger electrode configuration are taken near Khizarabad Dairy Form, district Sargodha. The instrument ABEM Terrameter SAS 300 is used for data acquisition. The quantitative in-terpretation is done by 1D modelling of resistivity soundings by using IX1D software. The results show that area is underlain by three geoelectrical layers as dry alluvium (resistivity range) and saturated alluvium with high resistivity (10-20 Ωm) and low resistivity (>10 Ωm) zones. Aquifer vulnerability is assessed by calculating Dar Zarrouk parameter (Longitudinal Conductance) and thickness of vadose zone. Resultant vulnerability is divided into three zones as low, moderate and high. It is concluded from this study that ERS sounding can be used for vulnerability assessment of an unconfined sandy alluvial aquifer form agricultural contaminants.