Map of Approved TMDLs in Maryland: 2010 Chesapeake Bay TMDLs

Please note that it may take several seconds for the map to load and refresh.

About the Map

The shaded polygons in the map above represent the 58 watershed segments associated with the Chesapeake Bay TMDL and WIP allocations in Maryland. Every segment is assigned a separate TMDL for each of three pollutants: nitrogen, phosphorus and sediment.

Related Maps

Nitrogen TMDL Map: Map of local nitrogen TMDLs in Maryland

Phosphorus TMDL Map: Map of local phosphorus TMDLs in Maryland

Sediment TMDL Map: Map of local Sediment TMDLs in Maryland

Water Quality Map for Nutrients: Information about nutrient impairments in Maryland's waters

Water Quality Map for Sediments: Information about sediment impairments in Maryland's waters

How to Use the Map

Clicking on a shaded polygon will display information about the TMDL for that Chesapeake Bay segment, including the segment name and ID. Each shape is also identified with a GIS ID number which corresponds to a record in the online TMDL search tool for each of the Chesapeake Bay TMDL pollutants.

To navigate the map, use your arrow to drag and pan. Click the plus and minus buttons to zoom in and out. Enter an address in the window (top right) to zoom to a location. Clicking on "Basemap" allows the user to change the background (e.g. aerial photography, topographic coverage, etc). Clicking on “View Larger Map” will take the user to a customizable map interface where additional layers may be added.

Please direct questions or comments concerning Maryland's TMDL Program to at (410) 537-3818.​​