Water resources are sources of water that are useful or potentially useful to humans. It is important because it is needed for life to exist. Many uses of water include agricultural, industrial, household, recreational and environmental activities. Virtually all of these human uses require fresh water. Only 3% of water on the Earth is fresh water, and over two thirds of this is frozen in glaciers and polar ice caps. Water demand already exceeds supply in many parts of the world, and many more areas are expected to experience this imbalance in the near future. The framework for allocating water resources to water users (where such a framework exists) is known as water rights.

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.
Meta Description: [ Atlas of principal bedrock aquifers,
aquifer systems and ground water in the United States ]
USGS - Arsenic in ground water of the United States - Publications, maps, and data on arsenic in U.S. groundwater.
Meta Description: [ Publications, maps, and data on arsenic in ground water of the United States ]
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.
Meta Description: [ Home page for water resources
information from the US Geological Survey ]
Watershed Information Network - EPA guide to information and services for protecting and restoring water resources. Includes state and local watershed information.
Meta Description: [ Environmental Protection Agency's Watershed Information Network. ]
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