Natural organic matter (NOM) in water influences ecosystems in natural water environmental and water quality in urban water supply systems. NOM abundance and characteristics are influences by the local ecosystems and climate. Thus, future global warming may alter the abundance and characteristics of NOM in water sources. “The IWA Specialist Conferences on NOM in water” has been held six times in the past, and provided opportunities for the scientists, engineering and practitioners to acquire the latest knowledge and technical development on NOM science. Since IWA has provided support through its endorsement to the past IWA NOM conferences, those events attracted many researchers from around the world. The successful organization of the past IWA NOM conferences has extended high reputation of IWA as an academic and professional organization around the world. The 7th NOM Specialist conference will also provide an outstanding opportunity for the researchers from around the world to present their latest research outcomes and to discuss future trends on NOM research. We believe IWA’s endorsement will make it certain that the 7th NOM Specialist Conference will be successfully advance the science on NOM in water and will attract many scientist to participate in this conference.