Thames Water Thames Water is the largest provider of water and wastewater services in the U.K., serving approximately 10 million water customers and 15 million wastewater customers. Draft Water Resources Management Plan Exhibition Panels The Draft Water Resources Management Plan Exhibition is designed to give people a view of the challenges facing your water supply and the actions that water boards plan to take. I was asked to create a series of pull-ups showing the contributions Thames Water were making towards the increased demand for water and sustainability issues.