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Water Resources Data of the United States (USGS)
This site provides "access to water-resources data collected at approximately 1.5 million sites in all 50 states, the District of Columbia, and Puerto Rico." Includes data for ground water, surface water, and water quality; for historical data, select the "Period of record" box on the site selection criteria search pages.
http://waterdata.usgs.gov/nwis/
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