This document discusses various types of water pollution including groundwater pollution, chemical pollution, nutrients pollution, urbanization, thermal and oil pollution. It describes how nutrients pollution can lead to algal blooms which reduce oxygen in water harming aquatic life. Urbanization is cited as a source of industrial and sediment pollution. The effects of water pollution on humans and marine life are also examined. Specific health impacts from bacteria, pesticides, lead and fluoride are outlined. The document concludes by suggesting ways to prevent water pollution such as reducing plastic use, treating industrial chemicals, and investing in water purification systems.