Groundwater contamination from poorly managed solid waste disposal remains a pressing environmental and public health concern in many developing urban areas. The Kurata Dumpsite in Ota, Southwestern Nigeria, poses a potential risk of leachate infiltration into surrounding aquifers, threatening water quality. This study aimed to assess the extent and pathways of contamination and to identify safer groundwater abstraction zones for sustainable water supply. An integrated geoelectrical and geochemical approach was adopted. Vertical Electrical Sounding (VES) and 2D Electrical Resistivity Tomography (ERT) were conducted to characterise the subsurface, while groundwater samples were analysed for major ions and trace metals. The geophysical results delineated a five-layer sequence comprising lateritic clay topsoil, sandy clay, a clayey layer, and two aquiferous sandy units. Resistivity models revealed leachate infiltration within the upper 13 m, with the clayey layer acting as a semi-confining barrier above deeper aquifers. Geochemical analysis showed that most parameters were within World Health Organisation (WHO) permissible limits; however, elevated potassium, calcium, cadmium, and chromium levels pointed to ongoing contamination from landfill leachate. The deeper fine sand aquifer (> 30 m) exhibited high resistivity and low contaminant concentrations, making it a safer source for potable water extraction. The findings underscore the need for continuous groundwater monitoring, improved landfill leachate management, and strict environmental regulation to safeguard groundwater resources and protect public health.