Since privatisation, water and sewerage utilities in the UK have been able to deliver almost year-on-year reductions. This applies to both the risk of properties flooding, and also to the actual incidents.
Prior to the summary above – taken from the detailed Ofwat Levels of Service report for 2002/3 – actual sewer flooding has reduced by a half in a decade. (Comparative numbers for 1992/3 report 4,811 sewer flooding incidents due to hydraulic overload and 6,000 due to other causes). So the industry has done well – but the customer still expects more. The reports for 2003/4, issued by Ofwat on 28 October, indicate startling progress, with a further 37% reduction in sewer flooding on the 2002/3 figures.