Maryland-Delaware-D.C. Water Science Center


Welcome to our Water Science Center! 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 in cooperation with other federal, state and local agencies, universities, and research centers. Feel free to examine the hydrologic data we collect and the scientific investigations we conduct at the MD-DE-DC Water Science Center.

See our video: Working with the USGS MD-DE-DC Water Science Center

Explore Our Capabilities

Explore Our Capabilities

We’ve created a series of websites thematically named to characterize our work as “Capabilities”. Our highly skilled staff work with a diverse array of cooperative partners to produce the high-quality output for which the USGS is world-renown.


Local Water Conditions

Local Water Conditions

Explore real-time streamflow, groundwater, and water-quality conditions and access data for MD, DE, and DC with our new interactive map application. This application offers data displays on multiple device platforms with various basemap options.

Local Water Conditions


Featured below are some popular features on the MD-DE-DC Water Science site. To better navigate our pages, please use the vertical header listing to the left side of this window.

Explore Our Capabilities

Water Conditions for Maryland

Water Conditions for Delaware

Water Conditions for Washington, DC

Science Center Seminars Series

Chesapeake Bay Activities

Try the New NWIS-MAPPER!



Date published: July 27, 2021

Newly Installed Super Gauge Helps USGS Monitor Water Quality, Bacteria Levels in Lower Anacostia River

Washington - A newly installed U.S. Geological Survey “super gauge” will provide people in the Washington area near real time information on bacteria levels and other water quality information for a portion of the Lower Anacostia River.

Date published: April 6, 2021

USGS Studies Low-Flow Changes in the Delaware River Basin

USGS scientists published a new study of low flow in streams in the Delaware River Basin. In general, the low flows measured during 1980-2018 increased along with increased precipitation, although low flows decreased in the Coastal Plain area, in the southern part of the basin, where water use and impervious surface...


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Year Published: 2021

Nitrogen in the Chesapeake Bay watershed—A century of change, 1950–2050

ForewordSustaining the quality of the Nation’s water resources and the health of our diverse ecosystems depends on the availability of sound water-resources data and information to develop effective, science-based policies. Effective management of water resources also brings more certainty and efficiency to important economic sectors. Taken...

Clune, John W.; Capel, Paul D.; Miller, Matthew P.; Burns, Douglas A.; Sekellick, Andrew J.; Claggett, Peter R.; Coupe, Richard H.; Fanelli, Rosemary M.; Garcia, Ana Maria; Raffensperger, Jeff P.; Terziotti, Silvia; Bhatt, Gopal; Blomquist, Joel D.; Hopkins, Kristina G.; Keisman, Jennifer L.; Linker, Lewis C.; Shenk, Gary W.; Smith, Richard A.; Soroka, Alexander M.; Webber, James S.; Wolock, David M.; Zhang, Qian
Clune, J.W., and Capel, P.D., eds., 2021, Nitrogen in the Chesapeake Bay watershed—A century of change, 1950–2050: U.S. Geological Survey Circular 1486, 168 p.,

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Year Published: 2021

Simulated effects of sea-level rise on the shallow, fresh groundwater system of Assateague Island, Maryland and Virginia

The U.S. Geological Survey, in cooperation with the National Park Service, developed a three-dimensional groundwater-flow model for Assateague Island in eastern Maryland and Virginia to assess the effects of sea-level rise on the groundwater system. Sea-level rise is expected to increase the altitude of the water table in barrier island aquifer...

Fleming, Brandon J.; Raffensperger, Jeff P.; Goodling, Phillip J.; Masterson, John P.
Fleming, B.J., Raffensperger, J.P., Goodling, P.J., and Masterson, J., 2021, Simulated effects of sea-level rise on the shallow, fresh groundwater system of Assateague Island, Maryland and Virginia: U.S. Geological Survey Scientific Investigations Report 2020–5104, 62 p.,

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Year Published: 2021

Is there an urban pesticide signature? Urban streams in five U.S. regions share common dissolved-phase pesticides but differ in predicted aquatic toxicity

Pesticides occur in urban streams globally, but the relation of occurrence to urbanization can be obscured by regional differences. In studies of five regions of the United States, we investigated the effect of region and urbanization on the occurrence and potential toxicity of dissolved pesticide mixtures. We analyzed 225 pesticide compounds in...

Nowell, Lisa H.; Moran, Patrick W.; Bexfield, Laura M.; Mahler, Barbara; Van Metre, Peter C.; Bradley, Paul; Schmidt, Travis S.; Button, Daniel T.; Qi, Sharon L.