Becoming more water efficient in our homes. Without action, there is a 25% chance in the next 30 years that large numbers of our households will have their water supply cut off for an extended period of time due to severe drought. Ideally we need to see water use in The U.K. fall. New homes are already built in a way that reduces demands for water, energy and material resources, but more needs to be done in the existing housing stock. Why should we be more water efficient in our homes?