Sewers for Adoption (7
edition) contains guidance for the design and construction of sewers that will be adopted by Sewerage Undertakers in England and Wales in accordance with Section 104 of the Water Industry Act 1991.
A new version of Sewers for Adoption has been published as a draft and is not yet in force. Further details can be found
Companies wholly or mainly in Wales
October 2012 the Welsh Government implemented Section 42 of the Flood and Water Management Act 2010 in the operating area of Dŵr Cymru Welsh Water. From 1st July 2018 Hafren Dyfrdwy which covers the remainder of Wales also became a company wholly or mainly in Wales and so Section 42 applies to their area as well. This requires any developer who wishes to make a connection to the public sewer system, that creates any sewers or lateral drains first to enter into a Section 104 agreement with the Water and Sewerage Company that will ensure the any sewers or lateral drains created by the connection will be adopted by the Sewerage Undertaker.
Companies wholly or mainly in England
Defra has not currently announced when they propose to implement this legislation in the area of companies wholly or mainly in England. Until this happens Section 104 agreements remain optional in the areas of the other Water and Sewerage Companies.
This website gives information of the standards and process for adoption in accordance with Section 104 of the Water Industry Act 1991.