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Water Science for Maryland, Delaware and the District of Columbia


Welcome to our homepage! This site is your source for water-resources information collected and interpreted by the U.S. Geological Survey representing Maryland, Delaware, and the District of Columbia.

The water resources of Maryland, Delaware, and the District of Columbia consist of numerous streams, springs, lakes, and aquifer systems. Streamflow, groundwater levels, and water-quality data are collected at numerous locations, and water-use data are collected throughout the area. We also maintain and monitor a network of real-time data-collection sites throughout the region. These hydrologic data and other data are used in research and hydrologic studies to describe the quantity, quality, and distribution of the area's water resources. The collection, analysis, and interpretation of these data are done in partnership with other federal, state and local agencies, universities, and research centers.

News & Features:

Allen Gellis Eastern Shore Contributes Excess Nutrients into Chesapeake Bay
New Study helps explain slow water-quality improvements to management actions
Storm tide sensor map thumbnail MD Storm-Tide Sensor Network Improved
The USGS is surveying locations throughout the state to expand the network of sensors to collect data about storms that threaten coastal communities

Team Based Projects

The USGS MD-DE-DC Water Science Center is organized into work teams to bring together projects that investigate similar water-resources issues, encourage sharing of individual expertise, data-collection methods, and personnel.

See what we're doing...

>> Fate & Bioremediation
>> Groundwater Studies
>> National & Regional Assessments
>> Surface Water Monitoring & Sediment Studies
>> Water Quality Monitoring & Modeling

SIR 2012-5185 Cover Page >>Scientific Investigations Report 2014–5224
Hydrogeologic Framework, Hydrology, and Refined Conceptual Model of Groundwater Flow for Coastal Plain Aquifers at the Standard Chlorine of Delaware, Inc. Superfund Site, New Castle County, Delaware, 2005–12
  >>U.S. Geological Survey Circular 1406
Understanding Nutrients in the Chesapeake Bay Watershed and Implications for Management and Restoration—The Eastern Shore

SIR 2013-5082 Cover Page >>Scientific Investigations Report 2014–5147
Sources of Fine-Grained Sediment in the Linganore Creek Watershed, Frederick and Carroll Counties, Maryland, 2008–10

  SIR 2013-5043 Cover Page >>Scientific Investigations Report 2014–5140
Hydrogeologic Characterization and Assessment of Bioremediation of Chlorinated Benzenes and Benzene in Wetland Areas, Standard Chlorine of Delaware, Inc. Superfund Site, New Castle County, Delaware, 2009–12

Image for Comprehensive
          Assessment of Water Supply in MD

NAWQA Chesapeake Bay
Maryland's water supply comes from streams and rivers, groundwater, and reservoirs. In the Baltimore region and other metropolitan areas, the primary source of water is surface water (streams or reservoirs). Water regulators, planners, and policy makers need to know how much water can be withdrawn from wells and streams without causing adverse impacts.
The National Water Quality Assessment (NAWQA) is a national program of the U.S. Geological Survey designed to provide consistent and reliable information on the quality of streams, groundwater, and aquatic ecology in the United States. Primary goals of the NAWQA program include determining the status of streams and groundwater, identifying changes over time, and understanding interacting natural and human influences on observed status and trends.
The Chesapeake Bay, the Nation's largest estuary, has been degraded due to the impact of human-population increase, which has doubled since 1950, resulting in degraded water quality, loss of habitat, and declines in populations of biological communities. Since the mid-1980s, the Chesapeake Bay Program (CBP), a multi-agency partnership which includes the Department of Interior (DOI), has worked to restore the Bay ecosystem.


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Page Last Modified: Thursday, April 09, 2015

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