American Society of Plumbing Engineers

International organization for professionals skilled in the design, specification and inspection of plumbing systems.
http://www.aspe.org

American Water Works Association (AWWA)

International nonprofit scientific and educational society dedicated to the improvement of drinking water quality and supply.
http://www.awwa.org

Water Online: Virtual community for the water industry

Daily news and product updates for professionals in the wastewater industry- Information on manufacturing, technology, equipment, supplies, and discussion forums, online chat, newsletter and software
http://www.wateronline.com/

American Society of Sanitary Engineering

News, publications, standards and certification information, plus details of upcoming meetings.
http://www.asse-plumbing.org/

IHE-Delft University

Department of Sanitary and Environmental Engineering. 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.
http://www.ihe.nl/

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.
http://www.sanitaryengineering.tudelft.nl/