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303(d) LIST
The term, "303(d) list," is short for the list of impaired waters (stream segments, lakes) that the Clean Water Act requires all states to submit for EPA approval every two years (even-numbered years). The states identify all waters where required pollution controls are not sufficient to attain or maintain applicable water quality standards and rank the waters taking into account the uses of the water and severity of the pollution problem. The federal regulations at 40 CFR 130.7 direct the states to:
- Identify the waters that require TMDLs (total maximum daily loads);
- Rank, or prioritize, those waters taking into consideration the water uses and severity of the pollution problem;
- Identify the pollutant(s) causing or expected to cause violations of the applicable water quality standards; and
- Identify the waters targeted for TMDL development in the next two years.
REGIONAL CONTACT
Robert Koroncai, Program Manager (3WP30)
Office of Standards, Assessment, and Information Management
U.S.
Environmental Protection Agency
1650 Arch Street
Philadelphia, PA 19103-2029
e-mail: henry.thomas@epa.gov
