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» Center for Environmental Education and Information - CEEI documents polluted streams in the United states by publishing on the web all the Clean Water Act 303(d) lists and documentation..

» Great Lakes Aquatic Habitat Network and Fund - Provides information and financial support to those working to protect and restore shorelines, lakes, rivers, wetlands, and other aquatic habitats in the Great Lakes Basin. Includes news and grant information..

» Ground Water Atlas of the United States - Online USGS publication describes U.S. ground-water resources by region. Covers the 50 states, Puerto Rico, and the U.S. Virgin Islands..

» RiverWeb's American Bottom Landing Site - Explore information about the environment, history, and cultures of this important part of the Mississippi River valley..

» USGS - Arsenic in ground water of the United States - Publications, maps, and data on arsenic in U.S. groundwater..

» USGS -- Water Resources of the United States - Information about water resources from the U.S. Geological Survey. Topics include ground water, surface water, water use, water quality, acid rain, toxic substances hydrology..

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