Water Supply Industry Interpretations and Advice

  • Area of Interest : Backflow prevention
  • Topic : Fluid category
  • Title : Backflow protection for hydrants or washouts
  • Clause Reference : Schedule 2 paragraph 15 & G15.3
  • Reference Number : B29
  • Decision Date : May 2004

Below ground mains fed hydrant outlets used for general purposes other than fire fighting are considered to be a fluid category 5 backflow risk and must be supplied via a suitable backflow prevention arrangement.

Mains fed hydrants specifically designated for fire fighting purposes in low risk areas such as caravan parks may, following a risk assessment, be considered a lower category of risk and may be installed below ground. In high risk areas such as abattoirs fire fighting hydrants directly connected to mains are only permitted above ground and their use is subject to agreement with the water supplier.