With the passage of the 1972 federal Clean Water Act (CWA) the states were to develop Total Maximum Daily Loads (TMDLs) for water quality limited waterbodies that set limits on the loading from point and nonpoint sources. The CWA §303(d) and the EPA Water Quality Planning and Management Regulations (40 CFR, Part 130) require each state to: 1 2. 3. Identify waterbodies that are water quality …