Click on the watershed labels to be taken to their respective pages.
The Total Maximum Daily Load (TMDL) program, established under Section 303(d) of the Clean Water Act, focuses on identifying and restoring polluted rivers, streams, lakes and other surface water bodies. TMDLs are prepared for waters identified as impaired on the 303(d) list in the Integrated Report.
Information about TMDLs and water quality monitoring are organized by large watershed. The watersheds are shown in the map to the right. Watershed names are linked to pages with further information. Ohio typically focuses on watersheds in preparing TMDLs.
What is a watershed?
A watershed is the area of land that drains into a lake or stream. Watersheds can be small - like the area that drains into the creek behind your house. Or, watersheds can be large - consider all the land, streams and rivers that drain into the Ohio River or Lake Erie.