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Water Environment Federation (WEF) - Founded in 1928, WEF is a not-for-profit technical and educational organization with members from varied disciplines who work toward the organization's vision of preservation and enhancement of the global water environment.
Water Environment Research Foundation (WERF) - WERF helps improve the water environment and protect human health by providing sound, reliable science and innovative, effective, cost-saving technologies for improved management of water resources.
Air & Waste Management Association (A&WMA) - A&WMA is a nonprofit, nonpartisan professional organization that provides training, information, and networking opportunities to thousands of environmental professionals in 65 countries.
International Water Association (IWA) - IWA is a global reference point for water professionals, spanning the continuum between research and practice and covering all facets of the water cycle.
Global Water Partnership (GWP) - GWP works to support the sustainable development and management of water resources at all levels.