Section 303(d) of the Federal Clean Water Act requires states to identify waterbodies that are not meeting water quality standards and to develop total maximum daily pollutant loads for those waterbodies. A total maximum daily load (TMDL) is the amount of a pollutant that a waterbody can assimilate without exceeding the established water quality standard for that pollutant. Through a TMDL, pollutant loads can be allocated to point sources and nonpoint sources discharging to the waterbody. The L'Anguille River, which is located in Planning Segment 5B, is a tributary of the St. Francis River in eastern Arkansas in the Delta ecoregion. The designated beneficial uses that have been established by the Arkansas Department of Environmental Quality (ADEQ) for the L'Anguille River include primary and secondary contact recreation; domestic, industrial, and agricultural water supply; and perennial delta fishery (ADEQ 1998a). ADEQ has established both narrative and numeric turbidity and fecal coliform standards that apply to the L'Anguille River.