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303(d) Information and Map

Section 303(d) of the Clean Water Act (CWA) establishes that states are to list (the 303(d) list) waters for which technology-based limits alone do not ensure attainment of applicable water quality standards (WQS).  The 303(d) list is to be submitted by the states to EPA on April 1 of each even numbered year.  The 303(d) list includes priority rankings set by the state for the listed waters.

 

Once the impaired waters are identified, Section 303(d) requires that the states establish total daily maximum loads (TMDLs) that will meet water quality standards for each listed water, considering seasonal variations and a margin of safety (MOS) that accounts for uncertainty.

EPA's regulations for implementing Section 303(d) can be found in the Codified Federal Register (CFR) for Water Quality Planning and Management at 40 CFR Part 130.  The regulations define terms used in Section 303(d) and otherwise interpret and expand upon the statutory requirements.

Final 2008 Water Quality Assessment and Listing Methodology

Draft 2010 Assessment and Listing Methodology

2008 303(d) Gis Files

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