Аннотация: The article presents the results of a study of water bodies used as sources of drinking water supply in the Sengileevsky district of the Ulyanovsk region. Priority pollutants in the water of underground sources are identified, which include silicon, iron, manganese and aluminum. It can be assumed that there is an indirect relationship between water quality and the incidence of a number of nearby diseases, liver and kidney diseases, digestive system diseases and urolithiasis.