The purpose of this action is to treat wastewater in the municipalities of San Roque and Los Barrios (Campo de Gibraltar). The project includes the execution of new collectors, pumping stations and regulating tanks, in order to increase the quality and treatment capacity of the current system. The San Roque WWTP will be built, with a maximum purification capacity of 120,000 hab. equivalent, 4 new pumping stations (EBAR), upgrade of the existing Carteia EBAR, three storm tanks (in Los Barrios, San Roque and Guadacorte), underground electrical attacks for the WWTP and pumping stations, as well as a network of collectors, of total length 14,100 meters.