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National Assessment Database
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National Assessment Database

The National Assessment Database summarizes electronic information submitted by the states to EPA. This information should not be used to compare water quality conditions between states or to identify statewide or national trends because of differences in state assessment methods and changes to EPA guidance. This represents the most recent electronically available state water quality information.

This website provides a summary of state-reported water quality information and allows the user to view assessments of individual waterbodies. It presents data in a format designed for quick reference by water quality professionals and those familiar with water quality reporting. EPA is working with the states to improve future electronic reporting.

Choose a state or territory from the map or pick list below to view its most current Water Quality Assessment Data. You can also view the 2004 and 2002 versions of this database. To view state data using an interactive mapping tool that displays a wide range of environmental information, go to Enviromapper for Water.
Map of the United States Alabama Alaska American Samoa Arizona Arkansas California Colorado Connecticut Delaware Washington, DC Florida Georgia Guam Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Northern Mariana Islands Ohio Oklahoma Oregon Pennsylvania Puerto Rico Rhode Island South Carolina South Dakota Tennessee Texas Trust Territories Utah Vermont Virgin Islands Virginia Washington West Virginia Wisconsin Wyoming
National Assessment Database
About this Database

National Water Quality Inventory Report to Congress, 2002 Reporting Cycle

Assessing Water Quality (Questions and Answers)

The 2002 National Assessment Database (Fact Sheet)

Previous National Water Quality Reports

Enviromapper for Water

Search for water quality assessment information about a particular waterbody. Select the state of interest, and enter a waterbody name.
State: Waterbody Name:  


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