Provinces of Argentina became provinces in 1951. Misiones did so in 1953, and Formosa, Neuquén, Río Negro, Chubut and Santa Cruz, in 1955. The last national territory, Tierra del Fuego, became the Tierra del Fuego, Antártida e Islas del Atlántico Sur Province in 1990. Argentina is a federation of twenty-three provinces and one autonomous city, Buenos Aires. Provinces are divided for administration purposes into departments and municipalities, except for Buenos Aires Province, which is divided into partidos and "localidades". Buenos Aires City itself is divided into communes ("comuna") and non-official neighbourhoods ("barrios"). Provinces hold all the power that they chose not to delegate
Water supply and sanitation in Mendoza Water supply and sanitation in Mendoza The debate about water supply and sanitation in Mendoza has been dominated by the controversial private concession for the provincial water company OSM granted in 1998 to a consortium led by Enron. While the concession improved water and sanitation services, it failed to meet all its specified targets. After the collapse of Enron the concession was overtaken by Argentine investors. Besides OSM water services in the province are provided by the three municipalities of Maipú, Luján and Tupungatu and 174 small not-for-profit operators. With 1.6 million inhabitants the province of Mendoza is the fifth