Water Supply Industry Interpretations and Advice

  • Area of Interest : Notification
  • Topic : Material change of use 
  • Title : Notification of changes relating to storage and use of fluid category 4 or 5 substances
  • Clause Reference : Regulation 1& 2
  • Reference Number : N05
  • Decision Date : June 2015

It is a requirement to notify any proposed plumbing work relating to a material change of use. This includes any changes to a plumbing system for the storage and/or use of substances which if mixed with water would be classified as either fluid category 4 or 5, for example the installation of a rainwater harvesting or grey water system in any premises.