 The concession in Cancun, the largest of the three cities, is the oldest concession, awarded in 1993.As of 2011, it is held by Grupo Méxicano de Desarrollo (GMD), which is part-owned by Suez Environnement from France.The privately held shares in the mixed public-private company in Saltillo, set up in 2001, are held by Aguas de Barcelona, a Spanish subsidiary of Suez Environnement.