Aquiris is the name of a consortium that was created in 2001 by Veolia Environnement, the biggest water services corporation in the world, and other companies to bid for the building and operation of the North Brussels wastewater treatment plant (WWTP), a €1.2 billion contract. Prior to that, most of Brussels' wastewater was not treated but dumped raw in rivers, an option which is no longer acceptable under a 1991 EU Directive (91/271/EEC) concerning urban wastewater treatment which requires all European cities to treat their wastewater before disposal.