they are not allowed to subcontract these services to specialised firms the drinking water management system leaves the communes with the choice of relying on their own water supply sources this is the case for of the communes in luxembourg of relying through the communal syndicates on water from the eschsursure syndicate sebes or of having a mixed arrangement four intercommunal syndicates and luxembourg city are members of sebes and deliver drinking water abstracted from the eschsursure reservoir for sewage there are syndicates each covering several communes some communes manage their sewer networks and treatment plants on their own