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