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WATS: Research in Watershed Sciences: Government Information
U.S. EPA: Watershed Information: The Environmental Protection Agency maintains an enormous amount of information about watersheds and water quality. This site is easy to use and intuitive.
U.S. EPA: STORET / WQX: The Environmental Protection Agency hosts two databases, STORET and WQX (Water Quality Exchange), which house data on water quality. WQX is used to upload data on water quality and STORET is used as a "home" for that data.