The number of domestic properties in the England & Wales currently paying for water by volume, i.e. via a water meter, is about 25%. Current projections estimating the number of households paying for water by meter in each company by 2030 is between 35% and 90% depending on the company. The rate at which meter penetration is expected to increase over the next 25 years is illustrated in the figure below (data from EA report Maintaining Water Supply 2004). This raises a number of questions; do we really know where our water is going? And will our grandchildren still be paying for their water based on the 1990 rateable value of their property.