Closed consultation: Water fittings: preventing backflow of water from toilet cisterns

Welsh Government

December 19
15:11 2022

This consultation closed on 3 October. We received 42 responses to the consultation, which have been analysed and carefully considered.

The government need to notify the World Trade Organisation (WTO) as a potential technical barrier to trade and the European Union, as required under the Northern Ireland Protocol because these changes are relevant to compliance in Northern Ireland.

Once this is complete, the government will publish the summary of responses, along with the final Regulator Specifications and test code sheets. We expect to publish them in summer 2023.


Seeking views on updating toilet specifications to stop cistern water from re-entering drinking water in properties and to understand the causes of leaking toilet valves.

This consultation was held on another website.

This consultation ran from

Consultation description

We want to know what you think about Defras proposed changes to 11 specifications made under the Water Supply (Water Fittings) Regulations 1999.

These regulations are needed to protect human health from contaminated drinking water. We need to update the specifications to reflect modern toilet designs.

One change will introduce a new backflow prevention arrangement in the toilet cistern. Another will introduce a new test to ensure that water from the toilet pan cannot contaminate the water in the cistern.

The other changes will make the rules consistent and clearer and focus on how a product must perform.

We also want to gather evidence on faulty toilet valves that cause a loss of water and look at what could be done to improve these products.

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