Wastewater treatment refers to the process of removing contaminants from water that has been used in households, industries, and agriculture. It is also known as sewage treatment or water purification. Synonyms for this term include purification, sewage management, sewage treatment, sewage disposal, wastewater management, water reclamation, greywater treatment, and effluent treatment. The aim of wastewater treatment is to make the water safe for reuse or disposal. The process of treating wastewater involves physical, chemical, and biological methods, which enable the removal of pollutants, microorganisms, and other harmful substances from water. Effective wastewater treatment is critical for protecting public health and the environment.