The water retail market allows customers to choose their retailer provider, enabling them to switch retailer. The process for switching retailer is defined in CSD 0102: Registration: Transfers.
All supply points receiving any water or sewerage services must be registered to a retailer. When a non-household customer changes its retailer, this change in responsibility is recorded in the Central Market Operating System (CMOS).
MOSL publishes monthly switching reports that show the overall switching rate by different types of customer.
Switch rate maps
The interactive maps below show the Water and Sewerage Wholesaler boundaries (including NAVs) published by Ofwat, as well as a high level overview of the switching rates in each of the wholesaler regions (measured as the number of successful T108 transactions per 1000 active tradable SPIDs owned by each wholesaler).