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Groundwater Wells in Calvert County, Maryland

The Calvert County Groundwater-Level Monitoring Network is a cooperative program between the Calvert County Department of Public Works, Bureau of Utilities, the Maryland Geological Survey, and the U.S. Geological Survey. This network of appoximately 42 wells is mainly focused on monitoring the deeper, confined aquifers that are affected by local and regional Groundwater withdrawal.

The major aquifers of interest are the Piney Point-Nanjemoy, Aquia, and Magothy aquifers. The Piney Point-Nanjemoy aquifer is primarily used for small water users, such as self-supplied domestic users and small businesses. The Aquia aquifer is the primary source of public water supply within the county. A recent study in the tri-county area of Southern Maryland (Calvert, Charles, and St. Mary’s Counties) drilled 6-monitoring wells to study the availability of water in the upper and lower Patapsco aquifers. As a part of this tri-county study, in Calvert County a monitoring well was drilled in both the upper Patapsco aquifer (CA Db 96), and lower Patapsco aquifer (CA Fd 85). Two water-table monitoring wells (CA Db 65, and CA Fc 13) are used as climate response wells for indicating local Groundwater recharge and drought conditions.

The U.S. Geological Survey and the Maryland Geological Survey began a Statewide cooperative monitoring network in 1943. Several private wells in the Solomons area (CA Gd 3 and CA Gd 4) of Calvert County were some of the first wells to be monitored. Well CA Gd 6 at the Calvert Marina, Solomons (formerly the U.S. Naval Amphibious Training facility) has been used for monitoring the Aquia aquifer since 1949 until 2004, and is the oldest Groundwater-level monitoring well on the Calvert County network. A well drilled by Calvert County in 2004 (CA Gd 61) as a part of this study for the real-time collection of water levels, is the newest well in the network, and will replace CA Gd 6 for measuring future Groundwater trends. The Table below lists selected Calvert County Groundwater-Level Monitoring wells shown on the clickable link map:

Monitoring Wells

Well Number
Aquifer/Formation Screened
Location Freq./Measure
CA Bb 10
Mt. Hope Twice Yearly
CA Bb 23
Cavalier Country Twice Yearly
CA Bb 27
Dunkirk Real-Time
CA Bb 28
Dunkirk Monthly
CA Cc 18
Randle Cliff Monthly
CA Cc 55
Upper Patapsco
Randle Cliff Twice Yearly
CA Cc 56
Randle Cliff Twice Yearly
CA Cc 57
Huntington Monthly
CA Db 47
Prince Frederick Real-Time
CA Db 65
Prince Frederick Monthly
CA Db 96
Upper Patapsco
Prince Frederick Recorder
CA Dc 35
Scientist Cliffs Twice Yearly 
CA Ed 32
Piney Point-Nanjemoy
White Sands Twice Yearly 
CA Ed 42
Calvert Cliffs Twice Yearly 
CA Ed 49
Piney Point-Nanjemoy
Long Beach Twice Yearly 
CA Ed 52
Calvert Cliffs Power Plant Recorder
CA Fc 13
Choptank-St.Marys Und.
Jefferson-Patterson St. Pk Monthly
CA Fd 51
Piney Point-Nanjemoy
Calvert Cliffs St. Pk Twice Yearly
CA Fd 54
Calvert Cliffs St. Pk Real-Time
CA Fd 70
Chesapeake Ranch Estates Twice Yearly 
CA Fd 85
Lower Patapsco Chesapeake Ranch Estates Recorder
CA Fe 22
Piney Point-Nanjemoy
Cove Point Twice Yearly
CA Gd 6 Aquia Solomons Twice Yearly
CA Gd 60
Calvert County  
CA Gd 61
Solomons Real-Time

Potentiometric Surface Maps

The Potentiometric Surface maps of the Aquia, Magothy, Upper Patapsco, and Lower Patapsco aquifers in Southern Maryland are presented below. These Potentiometric Surface maps are published annually by the U.S. Geological Survey as Open-File Reports. Potentiometric Surface maps are produced by collecting synoptic water levels over a short period of time from numerous wells throughout Southern Maryland in each of the four aquifers. These maps show the surface of the water levels related to sea level that reflect the static head. Areas that are stressed by extreme Groundwater withdrawal from well fields will display what is known in hydrologic terms as a cone of depression. On the Aquia aquifer Potentiometric Surface map, two areas in Calvert County show cones of depression, in the North Beach and Chesapeake Beach area, and in the Solomons area.

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Page Last Modified: Wednesday, January 18, 2017

CA Bb 23 CA Bb 27 CA Bb 28 CA Cc 56 CA Cc 18 CA Cc 55 CA Cc 57 CA Db 96 CA Db 47 CA Db 65 CA Dc 35 CA Ed 49 CA Ed 42 CA Ed 32 CA Fc 13 CA Fd 54 CA Fe 22 CA Fd 51 CA Fd 85 CA Fd 70 CA Gd 61 CA Gd 6 CA Gd 60 CA Bb 10 CA Ed 52 436,8,521,94