A clean and abundant water supply is a necessity for both human consumption and agriculture, so it is essential to understand the sources and pathways of water pollutants. This event will highlight the impact of water pollution on the natural environment and its downstream effects on the sustainability of water supply in the face of climate change. It will also showcase how isotope hydrology offers a powerful tool to unravel this complex web of interactions. By utilizing isotopic tracers, scientists can trace the movement and origin of contaminants in water systems, enabling the identification of pollution sources and pathways and aiding the implementation of effective mitigation strategies to sustain water quality.