Corporate Responsibility

Sewer flooding incidents.

Last reviewed:
Sewer flooding can occur when the sewer network becomes overwhelmed during intensive rainfall, or because of a blockage or collapse. It is a distressing and unpleasant experience for our customers, as well as posing an environmental risk.

The problem.

Although our sewer networks are largely in good condition, the combined effects of urbanisation, climate change, population growth, modern lifestyles and an ageing infrastructure mean many networks handle much larger volumes of wastewater than they were originally built for. In addition, sewer abuse - when the wrong things are put down the drain - also poses a challenge for our network.

We saw an improvement in our sewer flooding performance during 2016/17, with a 13 per cent reduction in sewer flooding incidents, and a 4.6 per cent reduction in sewer blockages compared to the previous year.

In 2016/17, 1106 properties suffered sewer flooding due to blockages, collapses or equipment failure – less than the previous year. In 2015/16, 1,214 properties experienced incidents of internal sewer flooding due to other causes.

We’ve continued to be proactive in our approach with sewer cleaning and promoting what our customers can do to help prevent sewer flooding occurring. Click on this link to read more on how we’re preventing sewer flooding.