Sewers for Adoption (7th 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.
Companies wholly or mainly in Wales
On 1st 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. 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.