Sewer
infrastructure that conveys sewage or surface runoff
Sewers are underground pipes that take away dirty water and human waste from homes, offices and many other places. Sanitary sewers lead to sewage treatment plants that remove the harmful and unwanted parts, returning clean water to the environment. Many rules and regulations exist for how clean the final discharge (effluent) must be. Storm sewers are usually simpler. Houses that do not have a connection to city sewer will have a septic tank.
Cleaning crews use special trucks and tools to help keep the sewers clear of grease, tree roots, and other blockages. More rural areas may have septic systems where sewers do not yet exist. In many urban areas, street gutters to carry rainwater are combined with sewers.
Wikimedia Commons has media related to Sewers.
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