National Water Quality Inventory Reports (Renewal)

Section 303(d) of the Clean Water Act requires States to identify and rank waters which cannot meet water quality standards (WQS) following the implementation of technology-based controls. Under Section 303(d), States are also required to establish total maximum daily loads (TMDLs) for listed waters not meeting standards as a result of pollutant discharges. In developing the Section 303(d) lists, States are required to consider various sources of water-quality related data and information, including the Section 305(b) State water quality reports. The State Section 305(b) reports contain information on the extent of water quality degradation, the pollutants and sources affecting water quality, and State progress in controlling water pollution. EPA's Assessment and Watershed Protection Division (AWPD) works with its Regional counterparts to review and approve or disapprove State Section 303(d) lists and TMDLs from 56 respondents (the 50 States, the District of Columbia, and the five Territories). Section 303(d) specifically requires States to develop lists and TMDLs "from time to time" and EPA to review and approve or disapprove the lists and the TMDLs. EPA also collects State 305(b) reports from 59 respondents (the 50 States, the District of Columbia, five Territories, and 3 River Basin commissions).

The latest form for National Water Quality Inventory Reports (Renewal) expires 2023-03-31 and can be found here.