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.

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.

Our Recent Publications

Water Conditions for Maryland

Water Conditions for Delaware

Water Conditions for Washington, DC

USGS Water Science Center Seminars & Talks

Maryland Storm-Tide Sensor Network

Freshwater Flow into Chesapeake Bay

Jump into NWIS WEB!


Date published: July 1, 2020

MD-DE-DC WSC Capabilities Sites

There's a lot of talent at the Maryland, Delaware, Washington, DC Water Science Center!

We’ve created a series of ten websites, thematically named to characterize our work as our “Capabilities”. Using these capabilities as headings within a dynamic framework, allowing for managed intra-capability, contemporaneous work with their respective partnerships allowing for...

Date published: May 12, 2020

USGS Responds to Spring Flooding

U.S. Geological Survey field crews are measuring flooding across the country as spring weather is in full swing. Warming temperatures, increased precipitation and snowmelt have caused moderate to major flooding in the upper Midwest, East Coast, Central Plains and the Southeast portions of the country.

Date published: September 16, 2018

Hurricane Florence Water Footprint Data Visualization

To learn more about USGS’ role providing science to decision makers before, during and after #Florence, visit the #USGS Hurricane Florence page at


Publication Thumbnail
Year Published: 2020

Zero or not? Causes and consequences of zero-flow stream gage readings

Streamflow observations can be used to understand, predict, and contextualize hydrologic, ecological, and biogeochemical processes and conditions in streams. Stream gages are point measurements along rivers where streamflow is measured, and are often used to infer upstream watershed‐scale processes. When stream gages read zero, this may indicate...

Zimmer, Margaret; Kaiser, Kendra E; Blaszczak, Joanna; Zipper, Samuel; Hammond, John; Fritz, Ken M.; Costigan, Katie H.; Hosen, Jacob D.; Godsey, Sarah E; Allen, George; Kampf, Stephanie K; Burrow, Ryan; Krabbenhoft, Corey; Dodds, Walter; Hale, Rebecca L.; Olden, Julian D.; Shanafield, Margaret; DelVecchia, Amanda; Ward, Adam S; Mims, Meryl C.; Datry, Thibault; Bogan, Michael A.; Boersma, Kate; Busch, Michelle; Jones, Nathan M. ; Burgin, Amy; Allen, Daniel

Publication Thumbnail
Year Published: 2020

Hydrogeology and shallow groundwater quality in the tidal Anacostia River watershed, Washington, D.C.

Groundwater hydrology and geochemistry within the tidal Anacostia River watershed of Washington, D.C. are related to natural and human influences. The U.S. Geological Survey, in cooperation with the District Department of Energy & Environment, began investigating the hydrogeology and groundwater quality of the watershed in 2002. Lithologic...

Ator, Scott W.; Denver, Judith M.; Dieter, Cheryl A.
Ator, S.W., Denver, J.M., and Dieter, C.A., 2020, Hydrogeology and shallow groundwater quality in the tidal Anacostia River watershed, Washington, D.C.: U.S. Geological Survey Scientific Investigations Report 2019-5128, 93 p.,

Publication Thumbnail
Year Published: 2020

Sequential biodegradation of 1,2,4-trichlorobenzene at oxic-anoxic groundwater interfaces in model laboratory columns

Halogenated organic solvents such as chlorobenzenes (CBs) are frequent groundwater contaminants due to legacy spills. When contaminated anaerobic groundwater discharges into surface water through wetlands and other transition zones, aeration can occur from various physical and biological processes at shallow depths, resulting in oxic-anoxic...

Chow, Steven J.; Lorah, Michelle M.; Wadhawan, Amar R.; Durant, Neal D.; Bouwer, Edward J.