Urban runoff is the term used to describe the flow of water from urban areas that is not absorbed by the ground. This water picks up pollutants from urban areas, such as chemicals, oil, grease, and sediment, and can end up in natural bodies of water, such as rivers and streams. Some synonyms for urban runoff include stormwater runoff, non-point source pollution, polluted runoff, and surface runoff. Regardless of the term used, the impact of urban runoff on the environment and human health is significant, making it crucial to implement strategies to manage and mitigate the effects of urban runoff.