The Water Resources in the South East group (WRSE) is a partnership of the six South East water companies, the Environment Agency, Ofwat, Consumer Council for Water, Natural England and Defra, to develop long term plans for securing water supplies in the South East. The water companies are: Affinity WaterPortsmouth WaterSES WaterSouth East WaterSouthern Water, and Thames Water.

Between us, we look after thousands of kilometres of water mains and deliver a reliable supply of high quality drinking water to almost 14 million customers in the most densely populated area of the United Kingdom. We work together to find and share both existing and new sources of water, so that we can ensure the security of supplies in the long term.