American Society of Plumbing Engineers - International organization for professionals skilled in the design, specification and inspection of plumbing systems.
American Water Works Association (AWWA) - International nonprofit scientific and educational society dedicated to the improvement of drinking water quality and supply.
Delft University of Technology - Department of Sanitary Engineering. Research and education programs on the 'urban water cycle', namely, including drinking water supply, waste water collection and urban drainage, and waste water treatment.
UNESCO-IHE Institute for Water Education - Goal is to contribute to the development of adequate water supply and waste management services world wide by improving the capacities of individuals and organizations active in and for the sector.
