Sewer Flooding | Dwr Cymru Welsh Water
Dwr Cymru Welsh Water

Monday, 17th February

With flooding still affecting many communities in Wales and Herefordshire, we are experiencing high volumes of calls due to the high winds and heavy rain and our crews are extremely busy.

Here are the organisations you may need to contact:

Natural Resources Wales - 0800 80 70 60 (24 Hours) - if the flooding is coming from a watercourse (such as a stream) that is about to or has burst its banks.

Your Local Council – if you suspect the flooding is resulting from rising groundwater or surface water run off.

Welsh Water Sewerage Services & Emergencies - 0800 085 3968 (24 hours) or report an issue via a webform – for flooding inside your property caused by a blocked or overloaded sewer.

Sewer Flooding

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.

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