It is a pleasure to serve under your chairmanship for the first time in my position in DEFRA, Ms Elliott. I thank all colleagues for showing such interest in and passion about a subject that I know we all care deeply about. Most of all, I thank my hon. Friend the Member for Bexhill and Battle (Huw Merriman) for securing the debate.
I also pay tribute to the two Ministers who were unable to speak in the debate but have listened intently: the Under-Secretary of State for Foreign, Commonwealth and Development Affairs, my hon. Friend the Member for Chichester (Gillian Keegan) and the Minister of State, Foreign, Commonwealth and Development Office, my right hon. Friend the Member for Hereford and South Herefordshire (Jesse Norman). I am very grateful for support.
It would be remiss of me not to mention the two previous Ministers who have done so much in this area: my hon. Friend the Member for St Austell and Newquay (Steve Double) and, of course, my wonderful predecessor, my hon. Friend the Member for Taunton Deane (Rebeccab Pow), to whom I pay particular thanks. They have not only taken up this issue professionally as Ministers, but campaigned pretty much their entire lives on it. That hard work has paid dividends: I am able to stand here today and talk about the improvements that this Government have made, and the pragmatic steps that enable monitoring. It is uncomfortable to hear the results of that monitoring, but without it we would not know where or how much we need to improve. To put some numbers on that monitoring, we have improved the systems from 5% in 2016 to 90% today—a tremendous improvement.
We are absolutely clear that we will not tolerate the failure of water companies to reduce the amount of storm sewage discharges. It is completely unacceptable. When it rains heavily, as has been discussed today, rainwater lands on roofs and impermeable surfaces. It is uncharacteristic of me to agree so much with the SNP spokesperson, the hon. Member for Kilmarnock and Loudoun (Alan Brown), but he has experience in this particular sector. We recognise that combined sewers are part of the problem, particularly during heavy precipitation, when all of that run-off from non-permeable surfaces flows with the foul water into the sewage treatment plant. We hold water companies to account for improving that situation, for splitting those systems and for a whole raft of other infrastructure changes, but that will take time.