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Open-File Report 2010–1205

Prepared in cooperation with the Maryland Geological Survey and the
Maryland Department of Natural Resources

Potentiometric Surface of the Upper Patapsco Aquifer in Southern Maryland, September 2009

By Stephen E. Curtin,1 David C. Andreasen,2 and Andrew W. Staley2

1U.S. Geological Survey, Baltimore, MD 21228.
2Maryland Geological Survey, Baltimore, MD 21218.
Thumbnail of front cover and link to report (461 KB)


This report presents a map showing the potentiometric surface of the upper Patapsco aquifer in the Patapsco Formation of Early Cretaceous age in Southern Maryland during September 2009. The map is based on water-level measurements in 65 wells. The highest measured water level was 118 feet above sea level near the northern boundary and outcrop area of the aquifer in northern Anne Arundel County. From this area, the potentiometric surface declined to the south toward a well field in the Annapolis-Arnold area, and from all directions toward three additional cones of depression. These cones are located in the Waldorf-La Plata area, Chalk Point, and the Leonardtown-Lexington Park area. The lowest measured groundwater levels were 26 feet below sea level at Annapolis, 108 feet below sea level south of Waldorf, 60 feet below sea level at Chalk Point, and 83 feet below sea level at Leonardtown. The map also shows well yield in gallons per day for 2008 at wells or well fields.

First posted January 2010

For additional information, please contact:

U.S. Geological Survey
MD-DE-DC Water Science Center
5522 Research Park Drive
Baltimore, MD 21228
(443) 498-5500

Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Acrobat® Reader, free of charge.

Suggested citation:
Curtin, S.E., Andreasen, D.C., and Staley, A.W., 2010, Potentiometric surface of the Upper Patapsco aquifer in southern Maryland, September 2009: U.S. Geological Survey Open-File Report 2010–1205, 1 sheet, available at

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