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Data from Decadal Change in Groundwater Quality Web Site, 1988-2020


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Lindsey, B.D., Levitt, J.P., and Johnson, T.D., 2021, Data from Decadal Change in Groundwater Quality Web Site, 1988-2020: 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 decadal sampling event) by the 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 again approximately 10 years later between 2002-2012 (second sampling event) to evaluate decadal changes in groundwater quality. Between 2012 and 2020 (third sampling event), a subset of these networks was sampled again, allowing additional results to be displayed on the web page: Decadal changes in groundwater quality ( This is the fifth iteration [...]


Point of Contact :
Bruce D Lindsey
Originator :
Bruce D Lindsey, Joseph P Levitt, Tyler D Johnson
Metadata Contact :
Jennifer B Sharpe
Publisher :
U.S. Geological Survey
Distributor :
U.S. Geological Survey - ScienceBase
SDC Data Owner :
Earth System Processes Division
USGS Mission Area :
Water Resources

Attached Files

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Decadal_Change_Network_Centroids_V5.csv 9.03 KB text/csv
Decadal_Change_Network_Wells_V5.csv 105.63 KB text/csv
Inorganic_Statistics_Table_C12_V5.csv 17.88 KB text/csv
Inorganic_Statistics_Table_C13_V5.csv 14.6 KB text/csv
Inorganic_Statistics_Table_C23_V5.csv 17.19 KB text/csv
Inorganic_Statistics_Table_C123_V5.csv 14.57 KB text/csv
Water_Quality_Data_V5.csv 2.1 MB text/csv
Water_Quality_Data_WhatsNew_V5.csv 2.69 KB text/csv


The purpose of this study is to determine if the quality of the Nation's groundwater has become better, worse, or stayed the same during 1988-2020. Evaluating changes in groundwater quality at the decadal scale is one component of a larger effort to understand the quality of the Nation's water resources and how water quality conditions are changing with time.



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



Additional Information


Type Scheme Key
DOI doi:10.5066/P9KE5YV7

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