There will be targets—there are water-quality targets in the Bill anyway—and the Minister referred to the guidance that she is on the point of finalising for the next pricing review period for Ofwat. My Committee, the Environmental Audit Committee, is currently conducting an inquiry into water quality, and we will make some recommendations to strengthen that guidance, so there are tools that can be used. That does not, though, get away from the fact that in my view there should be a primary legislative duty on water companies, to persuade them to treat this issue with sufficient seriousness.
People, including my hon. Friend the Member for Harwich and North Essex (Sir Bernard Jenkin), have quite reasonably asked what the proposal would cost. Last week, our Committee heard evidence from Thames Water, which is currently investing in the largest capital treatment-works programme in our lifetime. It is a £4.6 billion investment, the purpose of which is to take away 37 million tonnes of sewage, out of a total of 39 million tonnes spilt legally into the Thames by Thames Water. It will have a huge impact on the reduction of the amount of sewage that is legally spilt into the Thames. The cost will be an increase of £19 per household in the bills of Thames Water’s water-rates payers in London. That illustrates quite well that, although the costs of improving the network are going to be significant —possibly huge: the Minister gave a range that is even bigger than the amount the Government have spent to combat covid—it will take decades.
When we asked the Secretary of State about this issue last year, when he appeared before our Committee for a different inquiry, he acknowledged that we will not deal with the problem of exceptional spillages out of water-treatment plants until such a time as the drainage system completely separates surface water from foul water. There are something like 200,000 km of combined sewers underneath our streets and fields. While they are combined, it provides the opportunity for water-treatment plants to be overwhelmed by excessive rainfall. The Opposition spokesman, the hon. Member for Plymouth, Sutton and Devonport, made the point that it is meant to happen only on an exceptional basis, but it absolutely is happening routinely. We discovered that information after the Government put pressure on the water companies to introduce event-duration monitors, which they have now done across almost all the network. That is giving rise to the information that The Guardian is collating
that shows that the completely unacceptable spillage of sewage into rivers is routine. It has to stop. That was the intention behind my private Member’s Bill and is the reason why I continue to talk about this subject ad nauseum. I am much looking forward to the day when this Bill receives Royal Assent and I can get on to other matters.