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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. 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.

We also maintain and monitor a network of real-time data-collection sites throughout the region. Read our Science Strategy to learn more about our goals and operations.


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 (Coming Soon)
>> Surface Water Monitoring & Sediment Studies
>> Water Quality Monitoring & Modeling


USGS Water Science Center Seminar

October 29, 2014 11 a.m.

Roger Barlow (USGS)
3D Elevation Program (3DEP)

How to search for and acquire lidar data

Current and Previous seminars

Monthly Water Conditions

>>September 2014: USGS MD-DE-DC Monthly Water Conditions Summary

>> Groundwater Levels
>> Streamflow Statistics


New Publications Available Online

SIR 2012-5185 Cover Page >> SIR 2012-5185
Flux of Nitrogen, Phosphorus, and Suspended Sediment from the Susquehanna River Basin to the Chesapeake Bay during Tropical Storm Lee, September 2011, as an Indicator of the Effects of Reservoir Sedimentation on Water Quality
  SIR 2013-1034 Cover Page >> SIR 2013–1034
Water Quality in the Anacostia River, Maryland and Rock Creek, Washington, D.C.: Continuous and Discrete Monitoring with Simulations to Estimate Concentrations and Yields of Nutrients, Suspended Sediment, and Bacteria
SIR 2013-5082 Cover Page >> SIR 2013-5082
Water Volume and Sediment Volume and Density in Lake Linganore between Boyers Mill Road Bridge and Bens Branch, Frederick County, Maryland, 2012

  SIR 2013-5043 Cover Page >> SIR 2013-5043
Statistical Classification of Hydrogeologic Regions in the Fractured Rock Area of Maryland and Parts of the District of Columbia, Virginia, West Virginia, Pennsylvania, and Delaware

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: Friday, October 17, 2014

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