USGS Quality of Water - Ground

USGS Quality of Water Ground contains more than 19 million water quality observations taken at over 272,000 analysis sites throughout the United States. The data categories are State, HUC, County, Parameter, Station, Analysis, and Observation.
Agency
Data Source
Period of Record
Number of Stations
Data Elements

 US Geological Survey
NWIS
1875 - 2006
272,462
6,578 water quality parameters including
organics, inorganics, metals, and pesticides
USGS Quality of Water Ground is published on 4 regional CDs: 
		
West 1   AZ CA CO NM NV UT WY
West 2   AK HI ID KS MT ND NE OK OR SD TX WA
Central  AL AR IA IL IN KY LA MI MN MO MS OH TN WI WV
East     CT DC DE FL GA MA MD ME NC NH NJ NY PA PR RI SC VA VT
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