A worldwide association of environmental hydrologists. Site offers forums, a journal and modeling software.

www.hydroweb.com/

Interdisciplinary organization promoting an understanding of the history of the control and use of freshwater resources around the world. Includes information from and about association conferences.

www.iwha.net/

Member association of the Water Environment Federation, concerned with wastewater treatment and water quality. Organization information, public education materials about current issues, job postings, and related internet links.

www.iawpca.org/

Engineering of prestressed concrete water tanks, and post-tensioned concrete water tanks. Includes a virtual tank tour.

www.close-associates.com/

Membership group interesting in restoring and preserving water quality in this area of Louisiana. The coordinate, educate, monitor regulations, encourage citizen action.

www.saveourlake.org/

A 501(c)(3) non-profit membership organization whose mission is to enhance stewardship of the Missouri River.

www.moriver.org/

Organized and operates exclusively for scientific and educational purposes. Protects the public health and the environment

www.nmwwa.org/

Oversees protection of the aquatic and wildlife habitats, waters, and wetlands of the river basin. Includes organization information, watershed map, reports on chinook salmon recovery efforts and other activities, and links to related sites.

www.nisquallyriver.org/

Established to foster the management and protection of lakes and reservoirs. Organization information, events, news, glossary of lake and water terms, publication information, and directory of lakes-related service businesses.

www.nalms.org/

Designer and manufacturer of customized water treatment and recycling systems for the removal of oil, sediments, and other contaminants from wash-down water, bilge water, and process water streams.

www.oiltrap.com