National Brackish Groundwater Assessment


Definition of "Brackish"

Why Study Brackish Groundwater?

About the Study

Previous Work

Pilot Saline Studies

Sources of Dissolved Solids in Brackish Groundwater

How is Brackish Groundwater Being Used?

Related Links and News

Study Team

Contact Us

Water Census

Groundwater Resources Program Regional Groundwater Study

National Brackish Groundwater Assessment - Home page

The amount of fresh or potable groundwater in storage has declined for many areas in the United States and has led to concerns about the future availability of water for drinking-water, agricultural, industrial, and environmental needs. Use of brackish groundwater could supplement or, in some places, replace the use of freshwater sources and enhance our Nation's water security. However, a better understanding of the location and character of brackish groundwater is needed to expand development of the resource and provide a scientific basis for making policy decisions. To address this need, the Department of Interior's WaterSMART initiative, through the USGS Groundwater Resources Program, is conducting a national assessment of brackish aquifers.

Map of U.S. showing depth to saline groundwater, as an isopleth map.

Last National Saline Groundwater Assessment completed 48 years ago. Map was modified from Feth and others, 1965.

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