In Memphis, as in most cities, unaccounted for water is an appreciable item, and naturally is being given almost constant consideration. A recent check made by adding the registration of customers' meters to estimated consumption of a few unmetered connections, fails to check with our station output meters by about thirty percent. Of course, some of this loss is taking place in the mains, in services, in fire hydrants and blow-off valves. With due consideration to these various sources of leakage, it appears that a considerable amount of water is passing through meters that is not being registered. This can be due to inaccuracy of the meter and to flows which are smaller than the meter will operate on. It is generally true that in the premises of the customer, there is a twenty-four hour flow due to dripping bibbs, leakage at stop and waste cocks, flush tanks and other fixtures. The sum total of these inconsequential leaks reaches a rather surprising figure on the whole system. In Memphis, if we have an average seepage of one fourth of a pint per minute per service, this amounts to about two and a half million gallons of water per day. If we knew positively that the above surmise is actually what is taking place, our unaccounted for water problem would cease to be one of disturbing proportions. It would be a great deal of satisfaction to know just what is happening in this phase of leakage, regardless of the fact that nothing can be done about it, except to keep meters in the best practical condition. We have seriously considered making either a partial or complete survey to determine what this leakage within the customers premises amounts to, and to determine if the meter operated on such a flow; also to check the meter for accuracy on customary flows. A survey of this kind would serve two purposes: First, it would give the amount of water that is being wasted that fails to register on the meter, and second, it would show the performance of the meters. Our thoughts were then turned toward the practical features