 The Federal District constructed two pilot treatment plants in 1983 to study the potential for the advanced wastewater treatment of secondary effluent for potable reuse, and to examine the potential for treating contaminated ground water.Based upon results of the experimental treatment plants, a new treatment facility was constructed, with a capacity of 0.3 m3/s, and designed for both ground water treatment and direct potable reuse.The established goal of the reuse project was to blend the reclaimed wastewater with treated ground water and add it directly into the distribution system Currently, the reclaimed wastewater is being used for non-potable purposes.