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.