Due to a lapse in appropriations, the majority of USGS websites may not be up to date and may not reflect current conditions. Websites displaying real-time data, such as Earthquake and Water and information needed for public health and safety will be updated with limited support. Additionally, USGS will not be able to respond to inquiries until appropriations are enacted. For more information, please see www.doi.gov/shutdown
Maryland, Delaware, DC Water Science Center
The MD-DE-DC Water Science Center conducts hydrologic projects that address a wide variety of water-resources issues, including water supply, groundwater contamination, nutrient loading in streams, effects of land use on water quality, and basic hydrologic data collection.
Comprehensive Assessment of Water Supply in Maryland
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 Supply in MD
NAWQA Potomac River Basin and Delmarva Peninsula (PODL)
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.NAWQA PODL
Study Shows High Potential for GW to be Corrosive in Half of US
A new U.S. Geological Survey assessment of more than 20,000 wells nationwide shows that untreated groundwater in 25 states has a high prevalence of being potentially corrosive.Find out more...