Sarah Bool

It is absolutely right and correct that we debate these measures to improve the water industry. In the light of continued concerns over Thames Water and Southern Water, action must be taken to protect our water service. It is important to take a step back and put the debate into its proper context. We must appreciate that most of the UK has a combined sewerage system, meaning that both rainwater and wastewater are carried in the same pipes, before wastewater goes into a sewage treatment plant. If, as in recent weeks, we have exceedingly heavy rainfall, capacity can be exceeded and water companies are allowed to spill untreated wastewater into rivers and seas—otherwise, there is a risk of flooding people’s homes with waste. There has been an issue of companies doing that when there has been no rain—known as a dry spill—which is not acceptable. Although it has been miscommunicated by other parties and by the Secretary of State, the previous Government took the vital step of requiring storm overflows to be monitored. As hon. Friends have said, that monitoring increased from 7% in 2010 to 100% in 2024. It has enabled discussions and plans to fix the poor behaviour of the water companies. The overflows were always happening, but the previous Government’s monitoring caught the poor behaviour and highlighted the action that was required.