Last edited 21 Jul 2021



Sewerage (the sewer system), is the underground networks of pipes that carries sewage (waste water and excrement), waste water and surface water run-off, from buildings to treatment facilities or disposal points.

A sewer is; 'A pipe or channel taking domestic foul and/or surface water from buildings and associated paths and hardstandings from two or more curtilages and having proper outfall' Ref The SuDS Manual (C753), published by CIRIA in 2015.

Types of sewer include:

There are a number of ways of moving the contents of sewers:

A sewerage undertaker is: 'A collective term relating to the statutory undertaking of water companies that are responsible for sewerage and sewage disposal, including surface water from roofs and yards of premises.' Ref The SuDS Manual.

In September 2010, the government announced that most private sewers that connected to the public sewer network would be transferred to the ownership of the regulated sewerage companies in England and Wales. Private sewers that were connected to the public sewer network before 1 July 2011 were transferred on 1 October 2011.


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