MD-DE-DC Water Science Center


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 in cooperation with other federal, state and local agencies, universities, and research centers...

Chesapeake Bay Activities

Chesapeake Bay Activities

The USGS has the critical role to provide scientific information for the improved understanding and management of the Bay ecosystem. The USGS works with Federal, State, and academic science partners to provide research, assessment, and monitoring.

USGS Chesapeake Bay

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.

NEWS! Monthly Water Conditions

Water Conditions for Maryland

Water Conditions for Delaware

Water Conditions for Washington, DC

Recent Publications from MD-DE-DC

USGS Water Science Center Seminars & Talks

Maryland Storm-Tide Sensor Network

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Date published: March 7, 2018

USGS Flood Experts Respond to High Water in Central, Northeastern U.S.

Crews from the U.S. Geological Survey have been in the field for weeks measuring flooding in the Midwest and in the Mississippi River watershed, and more recently flooding and storm tides on the Northern Atlantic coast, as higher temperatures, heavy rain, snowmelt and nor’easters affected numerous states. 

Date published: October 14, 2016

New water-quality station is a step forward for Baltimore water pollution clean-up

Online sites will provide the first real-time, user-friendly Inner Harbor water information

Date published: July 13, 2016

Maryland Storm-Tide Sensor Network Strengthened

Vital coastal storm-tide information needed to help guide storm response efforts following major storms affecting Maryland will be more accessible than ever due to a new monitoring network the U.S. Geological Survey is currently building.

For more information, see



Year Published: 2018

Manure and fertilizer inputs to land in the Chesapeake Bay watershed, 1950–2012

Understanding changing nutrient concentrations in surface waters requires quantitative information on changing nutrient sources in contributing watersheds. For example, the proportion of nutrient inputs reaching streams and rivers is directly affected by when and where those nutrients enter the landscape. The goal of this report is to contribute...

Keisman, Jennifer L.D.; Devereux, Olivia H.; LaMotte, Andrew E.; Sekellick, Andrew J.; Blomquist, Joel D.
Keisman, J.L.D., Devereux, O.H., LaMotte, A.E., Sekellick, A.J., and Blomquist, J.D., 2018, Manure and fertilizer inputs to land in the Chesapeake Bay watershed, 1950–2012: U.S. Geological Survey Scientific Investigations Report 2018–5022, 37 p.,

Year Published: 2018

Monitoring the water-quality response of agricultural conservation practices in the Bucks Branch watershed, Sussex County, Delaware, 2014–16

The purpose of this study was to evaluate the effects of irrigation and cover crops as conservation practices on water quality in groundwater and streams. Bucks Branch, a stream in the Nanticoke River watershed in southwestern Delaware, was identified as having one of the highest concentrations of nitrate in all surface-water sites sampled by the...

Denver, Judith M.; Soroka, Alexander M.; Reyes, Betzaida; Lester, Todd R.; Bringman, Deborah A.; Brownley, Michael S.
Denver, J.M., Soroka, A.M., Reyes, B., Lester, T.R., Bringman, D.A., and Brownley, M.S., 2018, Monitoring the water-quality response of agricultural conservation practices in the Bucks Branch watershed, Sussex County, Delaware, 2014–16: U.S. Geological Survey Scientific Investigations Report 2018–5020, 43 p.,

Year Published: 2018

Estimated use of water in the United States in 2015

Water use in the United States in 2015 was estimated to be about 322 billion gallons per day (Bgal/d), which was 9 percent less than in 2010. The 2015 estimates put total withdrawals at the lowest level since before 1970, following the same overall trend of decreasing total withdrawals observed from 2005 to 2010. Freshwater withdrawals were 281...

Dieter, Cheryl A.; Maupin, Molly A.; Caldwell, Rodney R.; Harris, Melissa A.; Ivahnenko, Tamara I.; Lovelace, John K.; Barber, Nancy L.; Linsey, Kristin S.
Dieter, C.A., Maupin, M.A., Caldwell, R.R., Harris, M.A., Ivahnenko, T.I., Lovelace, J.K., Barber, N.L., and Linsey, K.S., 2018, Estimated use of water in the United States in 2015: U.S. Geological Survey Circular 1441, 65 p., [Supersedes USGS Open-File Report 2017–1131.]