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Total Maximum Daily Load (TMDL)

Section 303(d) of the Clean Water Act requires states, territories, and authorized tribes to list impaired waters and develop total maximum daily loads (TMDLs) for impaired waterbodies. A TMDL establishes the maximum amount of a pollutant allowed in a waterbody and serves as the starting point or planning tool for restoring water quality (EPA). ODOT developed a statewide TMDL Implementation Plan to provide consistency in its highway management practices in all TMDL watersheds.