In October 2011, over 37,000 km of private sewers transferred into the ownership of Severn Trent Water. Unfortunately, they were unable to plot the majority of transferred sewers onto their plans at that time, as no reliable records for most of these sewers existed.
Severn Trent have plotted transferred assets in areas where records were available from sources such as local authorities or developers. However, the locating and plotting of the majority of remaining assets is being done as they are located during day-to-day operations such as the unblocking of drains or repairing sewers. Given the number of transferred sewers, it is likely to be many years before the majority are plotted and a few may never be located and recorded.