 There were 13 wastewater treatment plants in the Federal District and 14 in the State of Mexico service area in 1994, treating a total flow of 2.62 and 1.69 m3/s respectively.The untreated portion of the wastewater is discharged to the drainage system, from where it is discharged to the North where it is being reused in irrigated agriculture.Large-scale irrigation infrastructure was built in the state of Hidalgo to distribute storm water and wastewater from Mexico City for the irrigation of Alfalfa as the main crop, as well as barley, wheat and corn.