Soil and groundwater pollutions are worldwide phenomena which result from both natural and anthropogenic sources. In this research, geophysical investigations involving geoelectric survey using ABEM SAS 300 Terrameter was carried out around three active dumpsites in Gusau, Northwestern, Nigeria for hydro-geophysical assessment of the contamination of soil and groundwater. Vertical electrical Soundings (VES) were conducted on the dumpsites by using Schlumberger array with maximum current electrode separations of 180 m. Five VES were conducted on each dumpsite making a total of fifteen VES along three profiles. The field data obtained has been analyzed using WinGlink software which gives an automatic interpretation of apparent resistivity. The VES results revealed three subsurface layers. The geologic sequence beneath the study area is composed of topsoil (clay to sandy-clay, sandy-lateritic), weathered basement, fractured basement and fresh basement.The topsoil has resistivity ranging from 1.5 Ωm to 48.2 mΩ while the thickness vary from 0.47 m to 3.37 m across the profiles. The second layer's resitivity vary from 5.4 Ωm to 144.35 Ωm and their thickness ranges from 1.36 m to 16.93 m. The third geoelectric layer has resisitivity from 70.0 Ωm to 6003.0 Ωm. The results revealed that the top soils in all the dumpsites were characterized by very low resistivity depicting possible pollution and contamination at all dumpsites. The dumpsites are depicted by differential decomposition of waste as zones of advanced decomposition and fresh waste are reflected by low and high resistivity respectively. The second and third layers show moderate to high resistivity values which are indicative of leachate absence. These areas are suitable for groundwater expolration. Findings from the study indicate that there may be possible contamination of shallow groundwater system in the nearest future if proper mitigation measures are not taken into consideration at the dumpsites.Solid wastes are produced on daily basis as a result of direct consequence of inevitable human activities. Refuse contents consist of various kinds of materials like metallic, organic and non-biodegradable materials [1]. The intensity of the human activities has led to increasing volume of solid

Groundwater contamination has been a worldwide phenomenon. In this research, geoelectric and geochemical surveys were carried out on three active dumpsites in Gusau metropolis for detection of groundwater contamination. Vertical electrical Soundings (VES) were conducted on the dumpsites using Schlumberger array with maximum current electrode separations of 180 m. Five VES were conducted on each dumpsite making a total of fifteen VES along three profiles. Thirty five (35) points were assessed from three wastes dumpsites using portable XRF equipment for the in-situ testing while fifteen (15) representative groundwater samples collected were taken to the laboratory for hydro-geochemical analysis. The field data obtained from VES was analyzed using WinGlink software. The VES results revealed three subsurface layers. The topsoil has resistivity ranging from 1.5Ωm to 48.2 Ωm while the thicknesses vary from 0.47 m to 3.37 m across the profiles. The second layer’s resistivity varies from 5.4 Ωm to 144.35 Ωm and their thicknesses’ ranges from 1.36 m to 16.93 m. The third geoelectric layer has resistivity from 70.0 Ωm to 6003.0 Ωm. The geoelectric results revealed that the top soils in all the dumpsites were characterized by very low resistivity depicting possible pollution and contamination. Environmental pollution models applied to the geochemical dataset revealed Zn, Pb and Cu as moderately contaminants which generally indicated severe potential contamination in the investigated area. While other analytic parameters such as Mn, Cr, Ni and Fe showed low contamination factors. Hydro chemical analysis showed that pH values recorded from the water samples ranged between 7.26 to 8.12 with mean value of 7.50, whereas, recorded Total dissolve solid (TDS) ranged between 377 to 1393mg/L with average concentration of 751.27mg/L. Findings from the study indicated that there may be possible contamination of shallow groundwater system in the nearest future if proper mitigation measures are not taken into consideration at the dumpsites.