Three of Wyoming's twenty-three counties were selected for in-depth studies of the public, private, and semi-public water supplies. The three counties - Campbell, Lincoln, and Natrona - were selected to reflect differences in type of water supply and surveillance being used. Twenty-three public supplies were surveyed in the three counties. In addition, the communities of Laramie, Saratoga, Sinclair, Rawlins, Thermopolis, and Worland, which add fluoride to their water supplies were surveyed to determine the adequacy of the fluoridation program.