http://www.usgs.gov/water/

USGS

The United State Geological Survey is an organization that monitors the health of our ecosystems and environment, the natural hazards that threaten us, the natural resources we rely on, and the impacts of climate and land usage change.  This is also a great site to explore water resources because since society depends on fresh and reliable water systems as well as fragile ecosystems, the USGS helps better understand water resources, with water quality information, data, publications, maps and projects.

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