The International Association of Hydrological Sciences (IAHS)
- This is the oldest and foremost international nongovernmental organization which deals with hydrology and water resources.
- http://www.cig.ensmp.fr/~iahs/

Midwest Water Analysts Association
- A professional organization located in WI, IL, and IN composed of water, waste water, environmental, and public health lab analysts and the organizations and businesses that support them.
- http://www.midwestwateranalysts.org/

Pacific Maritime Research
- Research company providing marine transportation, fast marine vessel, historical marine, and pacific hydrological services.
- http://www.pacificmaritimeresearch.org

American Geophysical Union Hydrology Section
- Members are concerned with the cycling of continental water (solid, liquid and vapor) at all scales, and with physical, chemical and biological processes driven by that cycling. Current news and information and links to other In
- http://hydrology.agu.org/

Northwest Regional Floodplain Managers Association
- A nonprofit organization for regional networking and support on issues of environmental quality, economic sustainability, and scientific discovery on a watershed basis in Alaska, British Columbia, Idaho, Oregon, and Washington.
- http://norfma.org/

Belgian Branch of the International Water Association
- A non-profit professional organization that welcomes everybody interested in the scientific and technical aspects of water and water management.
- http://biomath.ugent.be/biwa/

Wisconsin Environmental Laboratories Association
- Serves commercial environmental labs doing business in Wisconsin by informing and motivating members to do a better job which in turn results in benefits for members and the environmental industry.
- http://www.wislabs.org/

Stockholm International Water Institute
- Organized to combat the global water crisis through research and administration of awards, annual symposia held in Stockholm, and projects. Information about these efforts and downloadable publications on water and development topics.
- http://www.siwi.org/

Louisiana Water Environment Association (LWEA)
- Member association of the Water Environment Federation. Includes details of upcoming meetings and other organization information.
- http://www.lweaonline.org/

Texas Section American Water Works Association
- Water professionals dedicated to the promotion of a safe and sufficient supply of drinking water. Includes organization information and links.
- http://www.tawwa.org/

The Watershed Management Council
- Dedicated to the advancement of the art and science of watershed management. Site includes river/stream terminology and archives of conference proceedings and newsletters focused on various water-resources topics.
- http://www.watershed.org

Canadian Water Resources Association
- Promotes effective management of Canada's water resources by stimulating public recognition, awareness and understanding. Information on a wide range of water-related topics.
- http://www.cwra.org/

Rocky Mountain Water Environment Association
- An organization of professionals working together to preserve and enhance the watershed environments originating in the states of Colorado, Wyoming, and New Mexico.
- http://rmwea.org/

American Institute of Hydrology
- Purpose of AIH is to enhance and strengthen the standing of hydrology as a science and a profession by establishing standards and procedures to certify individuals qualified in hydrology and hydrogeology, establishing and maintaining ethic
- http://www.aihydro.org/

Water Environment Federation
- For individuals and organizations interested in water quality. News, regulatory information, technical discussions, links, jobs listings, and product information, on topics including domestic and industrial wastewater, biosolids, watersheds, and wetlands.
- http://www.wef.org/

International Association of Hydraulic Engineering and Research [IAHR]
- International non-governmental organization of engineers and scientists working in hydraulics and hydraulic engineering. Information about organization journals, conferences, and other topics.
- http://www.iahr.org/

American Society of Limnology and Oceanography (ASLO)
- Promoting limnology (the scientific study of lakes), oceanography and related sciences and fostering the exchange of information in aquatic science.
- http://aslo.org/

American Water Resources Association
- Promotes understanding of water resources and related issues by providing a multidisciplinary forum for education, professional development and information exchange.
- http://www.awra.org/

Pacific Northwest Chapter International Erosion Control Association
- Members solve problems caused by soil erosion and its by-product, sediment. Organization serves Alaska, British Columbia, Washington, Oregon, and Idaho.
- http://www.pnwieca.org/

International Association of Environmental Hydrology
- IAEH was founded in 1991 to meet the needs of the professional environmental hydrologist, in particular those working in the area of environmental cleanup, restoration, and pollution prevention.
- http://www.hydroweb.com/