Skip to main content

Data from Decadal Change in Groundwater Quality Web Site, 1988-2021


Publication Date
Start Date
End Date


Lindsey, B.D., May, A.N., and Johnson, T.D., 2022, Data from Decadal Change in Groundwater Quality Web Site, 1988-2021: 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 2021 (third sampling event), a subset of these networks were sampled again, allowing additional results to be displayed on the web page: Decadal changes in groundwater quality ( This is the sixth iteration [...]


Point of Contact :
Bruce D Lindsey
Originator :
Bruce D Lindsey, Amanda N. May, 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

Click on title to download individual files attached to this item.

Decadal_Data_Dictionary_V6.csv 5.37 KB text/csv
Inorganic_Statistics_Table_CY12_V6.csv 12.88 KB text/csv
Inorganic_Statistics_Table_CY13_V6.csv 14.42 KB text/csv
Inorganic_Statistics_Table_CY23_V6.csv 16.38 KB text/csv
Inorganic_Statistics_Table_CY123_V6.csv 13.82 KB text/csv
Decadal_Change_Network_Centroids_V6.csv 9.01 KB text/csv
Decadal_Change_Network_Wells_V6.csv 82.33 KB text/csv
Water_Quality_Data_V6.csv 4.28 MB 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 1988-2021. 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



Update by Bruce Lindsey on January 23, 2023 to replace the file "Water_Quality_data_V6.csv" with a version containing corrected station IDs.

Additional Information


Type Scheme Key
DOI doi:10.5066/P9FZT1WO

Item Actions

View Item as ...

Save Item as ...

View Item...