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Water Science for Maryland, Delaware and the District of Columbia

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Water Use

The U.S. Geological Survey (USGS) estimates water use by state, source of water, and category of use every 5 years. The withdrawals for Maryland, Delaware, and the District of Columbia are available in the tables below.

In 2010, 1,472 million gallons per day (Mgal/d) of freshwater were withdrawn from surface water and groundwater sources in Maryland, 300 Mgal/d in Delaware, and 0.10 Mgal/d in the District of Columbia. (Note: 2010 graphs coming soon.)

The Prettyboy Reservoir helps provide water for nearly 2 million residents in Baltimore City and parts of five neighboring Maryland Counties.
The Prettyboy Reservoir, Baltimore County, Maryland

2010 Water Use Data (Excel files)



District of Columbia

Historic Data

2000 Freshwater withdrawals in Maryland

National Water Use

USGS National Water Use Website

Thumbnail of 2010 Water Use Cover Page

USGS Publication:
Estimated Use of Water in the United States in 2010

Water use in the United States in 2010 was estimated to be about 355 billion gallons per day (Bgal/d), which was 13 percent less than in 2005. The 2010 estimates put total withdrawals at the lowest level since before 1970.

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2010 National Water Use by Category

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Page Last Modified: Friday, October 24, 2014