The quality of wastewater is an important measurement that determines the level of contamination and pollution in water. Synonyms for this term include water purity, water cleanliness, water sanitation, water hygiene, water safety, and water health. These synonyms are often used interchangeably to describe the condition and level of pollutants present in water. The quality of wastewater can be evaluated through various physical, chemical, and biological tests that measure the level of impurities, bacteria, viruses, organic matter, and other harmful substances. Improving the quality of wastewater is essential for protecting the environment and ensuring safe and clean water for human consumption and ecological sustainability.