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Branch of the USDA Agricultural Research Service (ARS) collecting water resource related data to monitor the environment as it is affected by land use.
Coverage includes water supply, water quality, policy and legislation, litigation and water rights, conservation, climate, and international water news.
Toxic Release Inventory data for the US. Sources and amounts of toxic chemicals released to air and water. Also has information on health effects and other topics.
Led by the United Nations Environment Programme (UNEP), the aim of GIWA is to produce a comprehensive and integrated global assessment of international waters. Information is available in English, Arabic, Chinese, French, German, Russian, Spanish, and Swedish.
Water quality and how aquatic life (fish, invertebrates, algae) is used to measure the overall health of the nation's waters. Lots of links to state and federal programs as well as other sites.