The indiscriminate disposal of solid waste has emerged as a critical environmental issue in developing nations due to rapid urbanization and population growth. Study explores the effects of unregulated solid waste dumping on the geotechnical properties of soil and the quality of water in Gubbi, Tumakuru. Soil collected at varying distances from the contamination source, and water samples were prepared through a simulated leachate process. Laboratory investigations, including tests on specific gravity, grain size distribution, Atterberg limits, unconfined compressive strength (UCS), and pH, alkalinity, and acidity of water, were conducted as per Indian Standard codes. Results indicated a decrease in specific gravity and UCS, and an increase in liquid limit and fine content with higher contamination levels, implying a weakening of soil structure. Water samples exhibited elevated alkalinity and a slightly alkaline pH, suggesting chemical contamination through leachate infiltration. The study concludes that unscientific solid waste disposal significantly degrades soil strength, alters soil consistency, and contaminates water resources, emphasizing the urgent need for sustainable solid waste management practices to mitigate environmental and public health risks.