The installation and use of cold water storage cisterns and sectional tanks connected to the public water supply must comply with the Water Supply (Water
Fittings) Regulations 1999 in England and Wales and the technically identical Scottish Water Byelaws 2004. Reference in this document to Regulations covers
the requirements of both sets of legislation. Similar regulations are planned for Northern Ireland.It is a legal obligation that the Water Supplier must be
notified in advance of most installation work on water systems (Regulation 5). One of the purposes of the Regulations is to prevent contamination of water and a
major risk of contamination is by backflow – the flow of water in a direction opposite to that intended. The level of backflow protection is determined by an assessment of the contamination risk posed by either the fluid in the cistern or the fluid or process downstream of the cistern.
Regulation 3 requires all water fittings to be installed, connected, maintained or disconnected in a manner which complies with the Regulations and Regulation 4 requires this work to be carried out in a workman like manner.