Time series analysis of water consumption patterns has not been investigated on a wide-scale basis. For many municipalities such efforts offer a means for developing potentially useful planning tools. Because data requirements are not extensive, model development is feasible in most areas of the world. The work at hand examines the applicability of such a tool in Chihuahua City, an important metropolitan economy in northern Mexico. Sample data are from January 1988 through December 2000. In addition to estimating a linear transfer function equation of water consumption in this city, the model is subjected to a series of simulation benchmark tests.