In 1984, the Department of Agriculture installed a dual bed activated alumina water treatment system at the Tortilla Campgrounds in the Tonto National Forest, Arizona. The original purpose of the system was to reduce the fluoride levels to below 4.0 PPM and arsenic level to below 50 PPB. The influent fluoride concentration from the groundwater well is approximately 4.0 PPM and the arsenic concentration is approximately 165 PPB. The significance of this project is that it has reliably removed both arsenic and fluoride from potable water for eighteen years, successfully meeting the newly adopted arsenic standard of 10 PPB. Includes 4 references, figures.