Maryland Department of Natural Resources

• Maryland Biological Stream Survey
• Stream Waders Program
• MERLIN Online - Map Maryland Your Way
• Spatially Intensive Monitoring
• Eyes on the Bay: Real-time data for the Chesapeake Bay and Maryland coastal bays

The Maryland Department of the Environment

• MDE Designated Uses and Use Classes (interactive map)
• MDE Water Programs
• MDE Water Supply Program
• MDE - Maryland Water Quality Monitoring
• MDE Stormwater Management Program
• MDE Wetland & Waterways Program

National Water Quality Monitoring Council

US Environmental Protection Agency

EPA Data Finder

Chesapeake Bay Program

Chesapeake Bay Program - Monitoring

Chesapeake Bay Program - Nutrients

ChesapeakeSTAT

Baystat Maryland

EPA STORET Dat​abase

EPA Biocriteria

US Fish and Wildlife Service

US Geological Survey

• Click here to obtain real-time streamflow data in MD-DE-DC.
• Click here to access NWIS web for Maryland (Real-time data, published daily means, stats, peak flows, field measurements)
• Click here to obtain instantaneous discharge data online.
• Click here to access the 2006-08 USGS Water-Data Reports for the United States (new web interactive format starting with 2006 water year data).
• Click here to access online USGS MD-DE-DC Water-Data Reports from water years 1997-2005.

The Student Conservation Association

Instream Flow Council

Susquehanna River Basin Commission

Susquehanna River Basin Commission - Fact Sheets

Chesapeake Bay Benthic Monitoring Program

Maryland Healthy Beaches Program

Chesapeake Bay Foundation

Baltimore County Watershed Management and Monitoring

Baltimore City Dept. of Public Works