Sewer/ˈsuːər/ Definition 1 of 2Pro Tip 1/3Urban Infrastructure Used when discussing city planning, sanitation, or infrastructure. The new development project includes a modern sewer to prevent flooding. Pro Tip 2/3Environmental Impact May involve discussions around pollution and the environment. The broken sewer caused contamination in the local river. Pro Tip 3/3Public Health Relates to community health as sewers dispose of waste to prevent disease. The city's health improved after the sewer system was upgraded.