National Water Quality Inventory Report to Congress
The National Water Quality Inventory Report to Congress (305(b) report) draws from two complementary sources of information on water quality. First, it summarizes the results of the statistically-representative National Aquatic Resource Surveys (NARS) conducted by the EPA in partnership with state and tribal water quality agencies. Second, it provides links to the local, site-specific assessment results reported by states in the Integrated 303(d)/305(b) Reports submitted biennially to EPA and available to the public through How's My Waterway
This new report provides an overview of the condition of the nation’s waters and provides links to additional information about water quality conditions across the U.S. and in priority waters:
Previous reports are available below:
- 2017 National Water Quality Inventory Report to Congress
- 2004 National Water Quality Inventory Report to Congress
- 2002 National Water Quality Inventory Report to Congress
- 2000 National Water Quality Inventory Report to Congress
- 1998 National Water Quality Inventory Report to Congress
- 1996 National Water Quality Inventory Report to Congress
- 1994 National Water Quality Inventory Report to Congress
- 1992 National Water Quality Inventory Report to Congress - Executive Summary