Burst water main affecting Llanrumney/St Mellons & surrounding areas of Cardiff, CF3

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Updated: 10:45 04 September 2025

Our teams have worked overnight to fix the burst water main and supply bottled water to over 700 vulnerable customers. The burst water main has now been fixed, and water supplies are now restored due to rezoning and tankering operations.

We are in the process of re-filling the network but this needs to be done carefully and slowly to avoid any further bursts. Some customers may still experience intermittent supply, low pressure or discoloured water as things return to normal. The bottled water stations will remain open this morning.

Bottled water stations are available at:

  • Eastern Leisure Centre, Llanrumney Avenue, CF3 4DN
  • Tesco Supermarket, St Mellons, CF3 0EF

We’d like to apologise for the inconvenience this has caused customers.

More information is available here.

Consumer Council for Water, Wales


The Consumer Council for Water is the independent voice for all water consumers in England and Wales.

It was established in 2005 to provide consumers with strong representation, making sure their interests are at the heart of decision-making in the water industry. It provides free advice to consumers and keeps them informed on the issues affecting water and sewerage services.

The Council takes up complaints of household and non-domestic customers when they are unable to resolve them directly with their water company. It settles 70% of complaints within 20 working days and 85% within 40 working days. Its work costs each water bill payer about 21p per year.

To find out more about the Consumer Council for Water in Wales, click here.