The All-Japan Water Supply Workers' Union (, Zensuido) is a

trade union A trade union (British English) or labor union (American English), often simply referred to as a union, is an organization of workers whose purpose is to maintain or improve the conditions of their employment, such as attaining better wages ...

representing workers in the water industry in Japan. The union was founded in 1951 by municipal workers involved in water supply and sewerage. The union affiliated to the

General Council of Trade Unions of Japan A general officer is an officer of high rank in the armies, and in some nations' air and space forces, marines or naval infantry. In some usages, the term "general officer" refers to a rank above colonel."general, adj. and n.". OED Online. Ma ...

, and by 1967, it had 31,699 members. It has been affiliated to the

Japanese Trade Union Confederation Rengo is a List of cities in Chile, city and Communes of Chile, commune located in the Zona Central, Chile, Zona Central of Chile, situated in the Cachapoal Province of the O'Higgins Region at a distance of south of the city of Rancagua and sout ...

since the late 1980s. By 2020, its membership had fallen to 16,281.

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{{Authority control Trade unions established in 1951 Trade unions in Japan