 In 2011, CONAGUA, Mexico's National Water Commission, approved a 764 million Mexican peso (47 million Euro) proposal by Spanish utilities group Acciona to convert El Caracol into a massive wastewater treatment plant.The planned facility would be capable of treating 2000 liters per second of black water from the overloaded Mexico City sewer system, discharging it as grey water to be used as agricultural irrigation in Atenco and Texcoco, thus potentially saving the city nearly 350 million gallons of drinking water a day.The facility, which began operating in 2013, pumps its 2nd-stage treated water to another facility in Atotonilco for further treatment.