Brackish groundwater and its potential as a resource in the southwestern United States

Fact Sheet 2018-3010
By: , and 



Secure, reliable, and sustainable water resources are fundamental to food production, energy independence, and the health of humans and ecosystems. But the large-scale development of fresh groundwater resources has stressed aquifers in some areas, causing declines in the amount of groundwater in storage and decreases in discharge to surface-water bodies like rivers and springs (Reilly and others, 2008). In some parts of the southwestern United States, the water supply is not adequate to meet demand without substantial effects on groundwater storage or surface discharge, and severe drought intensifies the stresses affecting water resources.

In support of the national census of water resources, the U.S. Geological Survey (USGS) completed the national brackish groundwater assessment to provide information about brackish groundwater as a potential resource to augment or replace freshwater supplies (Stanton and others, 2017). The objectives of the brackish groundwater assessment were to consolidate available data into a comprehensive database of brackish groundwater resources in the United States and to produce a summary report about the distribution, physical and chemical characteristics, and use of brackish groundwater. This fact sheet summarizes the occurrence of brackish groundwater and factors affecting its usability in the southwestern United States (specifically the Southwest Basins region) reported for the national study. The map below (fig. 1) summarizes the brackish zones for the five largest principal aquifers within the southwestern United States, along with groundwater resources in the remaining part of the region (Reilly and others, 2008).

Suggested Citation

Anning, D.W., Beisner, K.R., Paul, A.P., Stanton, J.S., and Thiros, S.A., 2018, Brackish groundwater and its potential as a resource in the southwestern United States: U.S. Geological Survey Fact Sheet 2018–3010, 6 p.,

ISSN: 2327-6932 (online)

Study Area

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Brackish groundwater and its potential as a resource in the southwestern United States
Series title Fact Sheet
Series number 2018-3010
DOI 10.3133/fs20183010
Year Published 2018
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Arizona Water Science Center
Description 6 p.
Country United States
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