This study focuses on characterizing landfill leachate and assessing its impact on surrounding groundwater at the Bandhwari landfill site. Leachate samples collected from landfills show high levels of organics, nutrients, salts, and heavy metals, indicating a methanogenic phase at the landfill site. We collected fourteen groundwater samples and five leachate samples from different parts of the study area in June 2023. The physicochemical parameters of these samples showed big differences, with mercury, copper, lead, cadmium, chromium, iron, and zinc being the most common contaminants. The significant changes in groundwater quality indicate the influence of leachate. Comparison with World Health Organization (WHO) and Bureau of Indian Standards (BIS 10500:2012) guidelines highlights the inadequacy of most groundwater samples for potable use. These findings underscore the need for targeted policies and treatment programs to mitigate landfill leachate impacts and control groundwater pollution in the area