There are several synonyms for the term "city sewer," including municipal sewer system, public wastewater system, and sanitary sewer network. These terms all refer to the underground infrastructure of pipes, pumps, and treatment facilities that transport and treat wastewater from homes and business in urban areas. Other synonyms include sewage system, drainage system, and sewerage network. These terms all allude to the collective system of pipes and facilities that are responsible for removing and treating wastewater in cities and towns across the world. Although these terms may differ in their literal meaning, they are typically used interchangeably to describe the same essential infrastructure.