A man-made body of water in which waste is consumed by bacteria. Oxidation ponds are also referred to as equilibrium ponds or lagoons due to their large sizes and shallow ends that help purify wastewater through the incorporation of bacteria, sunlight, and algae. Photosynthesis is the process that utilizes algae and distributes it into the air through aerobic bacteria. Oxidation ponds work by eradicating contaminants such as nitrogen, phosphorous, biological substances, and bacteria that are existent in wastewater that is discharged to streams.