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Data from Decadal Change in Groundwater Quality Web Site, 1988-2014, Version 2.0


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Lindsey, B.D. and Johnson, T.D., 2018, Data from Decadal Change in Groundwater Quality Web Site, 1988-2014, Version 2.0: U.S. Geological Survey data release,


Evaluating Decadal Changes in Groundwater Quality: Groundwater quality data were collected from 5,000 wells between 1988-2001 (first sampling event) by the U.S. Geological Survey’s National Water-Quality Assessment Project. Samples are collected in groups of 20-30 wells with similar characteristics called networks. About 1,500 of these wells in 67 networks were sampled about 10 years later between 2002-2012 (second sampling event) to evaluate decadal changes in groundwater quality. Between 2012 and 2014 (third sampling event), a subset of these networks has been sampled again, allowing additional results to be displayed on the web page: Decadal changes in groundwater quality. Changes to this web page are referred to herein as Version [...]


Attached Files

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“Organics Data Tables and Metadata from Version 1”
151.09 KB application/zip
“Data Tables and Metadata for Version 2”
237.69 KB application/zip
Original FGDC Metadata

53.61 KB application/fgdc+xml 52.44 KB application/zip


Data were collected as a part of the NAWQA Land use studies or Major aquifer studies. Initially data were collected to characterize the quality of shallow and medium depths of groundwater in the nation. Subsequent samples were collected to evaluate changes in concentrations over a decadal time span.


Spatial Services

ScienceBase WMS


  • National Water-Quality Assessment Project
  • USGS Data Release Products

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DOI doi:10.5066/F7N878ZS

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