- Adirondack Aquatic Institute - Non-profit specializing in lake & watershed management.
- Center for Multiphase Research - Flow and transport of non-aqueous phase liquids underground. Remediation of sites contaminated by gasoline and other toxic liquids.
- The Centre for Petroleum and Mineral Law and Policy - Academic & Practical post-graduate studies in international water resources law & policy. LL.M, MSc., MBA in water resources law & policy.
- Chesapeake Bay Trust
- Florida Water Guardians Project - A way to help preserve our most valuable resource, water. It was founded by Barton L. Bibler, P.E. with Clyde Butcher.
- Foundation for Cross-Connection Control and Hydraulic Research - The Foundation Approves Backflow Prevention Assemblies, Trains Backflow Assembly Testers and Program Specialists, and offers training tools
- Gulf of Mexico Program - Information Network
- International Association for Environmental Hydrology
- Int. Inst. for Infrastructural, Hydraulic and Environmental Engineering, IHE Delft, The Netherlands - International training and research institute
- Karst Waters Institute - KWI - a non-profit institution established to improve understanding of karst water sytems, through scientific research and public and professional education.
- Lenox Institute of Water Technology - Non-profit educational & research offering Master of Engineering in Water Technology. Emphasis on dissolved air flotation water clarification.
- Limnological Institute, University of Konstanz - Inistute for limnological research, Lake Constance, Germany
- National Estuary Program
- Northeast River Forecast Center - the NWS office responsible for providing river forecast guidance for New England and New York
- Pacific Institute for Studies in Development, Environment, and Security - A non-profit research and policy center looking at problems of environmental degradation, sustainability, and environmental security
- San Francisco Estuary Institute - The San Francisco Estaury Institute is a private, non-profit organization that was established to coordinate research on the San Francisco Estaury.
- Water Quality Informtion Center - Information on water resources as related to agriculture.
- Water Resources Research Center - developed to better provide waterinformation to professionals and interested members of the public.
- World Water Council - International long-term strategy center for assessing water resources challenges in the next century and formulating options for actions that should now be taken.