Bathroom Backflow Risks


Urinals are considered to be a fluid category 5 risk.

There are two accepted methods for using mains supplied water to flush urinals:

  1. A pressure flushing valve and Type DC device arrangement installed in accordance with the requirements of schedule 2 paragraph 25(c) in the relevant legislation in England, WalesScotland and Northern Ireland.


2. A flushing cistern which is supplied via an appropriate form of fluid category 5 backflow protection.



















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Uncontrolled if downloaded. This is informative, non-statutory guidance and intended for general guidance purposes only; it is subject to change.

Compliance with this information should not be relied upon as guaranteeing no enforcement action will be taken by water undertakers. Water Regs UK accepts no liability for loss, indirect or consequential loss arising from or in connection with this guidance document.