I thank the hon. Lady for clarifying. As I said, I share the passion of the people who signed the petition, so I am not arguing about that.
The petition calls for the complete elimination of storm overflows. We need to look at how possible that is and what the function of overflows is in emergency situations. We need to look at the whole issue in the round. The recently published storm overflows evidence project report shed some light on that and the costs that we are looking at. The hon. Member for Plymouth, Sutton and Devonport keeps asking about that, but he can read all about it in an independent survey published on gov.uk. It highlights that the cost of complete elimination would be between £350 billion and £600 billion.
When we are looking at all those things, we also need to consider all the other things that we have to deal with in terms of water, such as phosphates, nitrates and soil in the water. Several right hon. Friends rightly referred to that and how complicated the picture is. We are dealing with it, as we need to.
Work is under way on that timeframe to reduce and potentially eliminate overflows. The hon. Member for Harrow West (Gareth Thomas) made some interesting points about consumer involvement and bringing the public along so that they understand what we are doing. Water companies consult consumers but, of course, that does not change their obligation to meet their requirements and regulations in law.
That is where the Government’s direction to Ofwat, the regulator, is important. We have just produced our draft strategic policy, in which we flagged the issue of storm overflows and reducing the harm for the first time. We also put the environment at the top of the agenda. I am sure we all share the view that that is the right thing to do.
The issue of enforcement has been raised several times. Action is taken and must be taken, but I understand the frustration about how long it can take. The Southern Water enforcement took years, but the fine was £90 million, which sent a clear message. Thames Water has also had some significant fines, but it is now spending £4.4 billion on the Thames Tideway Tunnel. That will be a game changer, rightly treating sewage that goes into the Thames. We have seen progress, although that is not to say that we do not need to go a great deal further.
We have seen some action. The shadow Minister keeps asking, “What is happening now?” There is some action. Yes, we need more, but through the taskforce we instigated a call for action that is happening right now. Importantly, water companies are spending £144 million in additional investment on storm overflows in the period 2020 to 2025, on top of the £3 billion they are already spending on the environment.