This study included water quality analysis in hilly areas with focus on Tehri village in Tehri Garhwal district of Uttarakhand. Water samples were collected from three different locations representing different geographical and patient exposures. All the testing and analysis of samples were done at Uttarakhand Jal Sansthan, Tehri. Uttarakhand Jal Sansthan, Tehri, Uttarakhand, has both standard and modern equipment for conducting water sampling. The field study involved gathering samples from three distinct sources, such as the Tehri reservoir, a local open stream (dhara), and a hand pump. The samples were sent to Uttarakhand Jal Sansthan, Tehri, for identification. The weighted average method results of the three models were compared with each other in various ways. The water quality index values obtained for the three samples were compared to the expected values of the water quality index. The testing process conducted by Uttarakhand Jal Sansthan, Tehri, involved chemical and biological examinations to evaluate the overall quality of water at each chosen site. By comparing the findings with established water quality standards and guidelines, we can gain insights into the environmental consequences and potential health hazards linked to water consumption in the study region. This research offers valuable insights into the quality of water in mountainous regions. This will assist policy makers, environmentalists, and local communities in devising efficient strategies for water management and conservation in the Tehri district and its neighboring regions. The study emphasizes the significance of cooperation between research institutions and local authorities to guarantee effective and sustainable water management in difficult regions.