■ American Academy of Environmental Engineers, AAEE

■ American Institute for Pollution Prevention

■ American Water Resources Association

■ American Water Works Association

■ Air & Waste Management Association, AWMA

■ Association of Metropolitan Water Agencies

■ Association of Water Technologies

■ British Hydrological Society

■ Canadian Water & Wastewater Association

■ Chartered Institute of Water and Environmental Management 

■ Consortium of Institutes for Decentralized Wastewater Treatment 

■ Environmental and Engineering Geophysical Society

■ Environmental Resource Center

■ Environmental Research Institute of Michigan, ERIM

■ Environmental Protection Agency, EPA 

■ Global Hydrology and Climate Center (GHCC) 

■ Information Center for the Environment 

■ Institute of Hydraulics and Hydrology 

■ Institute of Hydrology 

■ International Association of Hydraulics Research, IAHR

■ International Association of Hydrological Sciences, IAHS

■ International Association on Water Quality 

■ International Society of Indoor Air Quality and Climate

■ International Solid Waste Association

■ Japan Society of Hydrology Sciences

■ Malaysian Water Association

■ National Ground Water Association

■ National Society for Clean Air, NSCA 

■ Resource Renewal Institute

■ National Association of Environmental Professional

■ Soil and Water Conservation Society

■ Solid Waste Association of North America

■ US Environmental Protection Agency

■ Water Environment Federation

■ Water Quality Association

■ World Environmental Federation