This study investigates the hydrochemical characteristics and pollution sources affecting the water quality of the Nworie and Otamiri Rivers in Owerri Metropolis, Nigeria. These rivers are essential for domestic, industrial, and agricultural uses, but are threatened by both point and non-point source pollution. The study utilized Durov diagrams to analyze water samples, revealing that ion exchange reactions are the primary hydrochemical processes influencing water quality. The samples were predominantly classified as intermediate-type water with chloride-type anions, though variations such as magnesium-rich and sodium plus potassium types were noted. The pH and Total Dissolved Solids (TDS) values exhibited systematic trends, suggesting natural geochemical processes and anthropogenic influences. Increasing activities along the watersheds, including runoff from rainfall carrying pollutants, have transformed previously point-source pollution into more complex non-point source pollution, complicating monitoring and control efforts. As observed in the post-confluence samples, the classification of water samples into different cation and anion types indicates diverse sources and interactions, including potential mixing with seawater in certain areas. The findings underscore the need for comprehensive water quality management strategies to address these rivers' diverse and dynamic contamination sources. Further research, including isotopic analysis and detailed chemical characterization, is recommended to better understand the region's environmental and human factors influencing water quality.