This report describes the source treatment and volumes of water used for public supplies by Colorado s cities and towns Previously information on the water supplies of many of the smaller cities and towns was not readily available. This report presents in one volume a compilation of comparable data on the water supplies of most of the cities and towns in the state but only summarizes the mass of data available from the larger cities. Also included are discussions of the State's surface-water and ground-water resources as related to public water supplies, and a discussion of the chemical quality of water related to uses.