Dwr Cymru Welsh Water

If you think your property has been flooded by our public sewer, please call us on 0800 085 3968 and one of our team will be here to help, 24 hours a day.

Climate change and population growth, together with the paving over of green spaces which provide natural drainage in our communities, are putting increasing pressure on our sewerage network. This is often made worse by people putting unsuitable products down the sink or toilet, increasing the risk of sewer flooding.

Many areas have separate sewers to take foul waste and rainwater, but most of our sewers are combined, meaning that foul sewage from kitchens and toilets mixes with rainfall. This means that, during a heavy storm, the flow in the sewer is much greater and can reach maximum capacity.

Our sewers are designed to cope with the vast majority of storms but occasionally rainfall can be so heavy that it overwhelms the system. When this happens, sewage can overflow from manholes and gullies and flood land and gardens. In the worst cases, sewage can even flood homes and cause pollution.

Sewer flooding is unacceptable and we treat all cases with the highest priority.

We prioritise our investment for potential flood alleviation schemes depending on the severity and frequency of flooding. As a result it is important that you report all flooding so we can keep our records up-to-date.