Promoting international networks of sewage organizations is one of the important roles of GCUS. GCUS regularly conducts international activities through a network of overseas sewage-related organizations. With this network, GCUS collects relevant information in order to promote international cooperation in sewage technology.
International institutions GCUS works together with include:
・ Water Environment Federation (WEF)
・ European Water Association (EWA)
・ Korean Water & Wastewater Works (KWWW)
・ International Water Association (IWA)
・ African Water Association (AfWA)
By utilizing these international networks as well as domestic networks, GCUS provides useful information and knowledge on sewage treatment through website, seminars, and workshops.