Pollutants must be removed from the wastewater to help protect the environment and public health. When water is used in our community, the water becomes contaminated with human waste. If left untreated, these pollutants would negatively affect our water and environment. For example, organic matter can cause oxygen depletion in lakes, rivers, and streams. This biological decomposition of organics could result in fish kills and/or foul odors. Nutrients in wastewater, such as phosphorus, can cause premature aging of our lakes, called Eutrophication. Waterborne diseases are also eliminated through proper wastewater treatment. Additionally, there are many pollutants that could exhibit toxic effects on aquatic life and the public.