The Assessment Database (ADB) is a relational database application provided by EPA for tracking water quality assessment data, including use attainment, causes and sources of impairment. The Department of Environmental Quality (DEQ) uses ADB to store its Water Quality Assessment (305(b)) and Impaired Waters (303(d)) information. In an effort to make this information more accessible to the public, DEQ has developed an internet based GIS application which allows users to zoom to an area of interest and retrieve assessment information for specific waters.

This application uses data from the 2010 Final 305(b)/303(d) Water Quality Assessment Integrated Report which was EPA approved on February 9, 2011.

To begin using the application click the link below.

The environmental data contained in this application is for REFERENCE ONLY and is NOT certified to be absolutely complete or correct. Specific data of concern should be verified with DEQ prior to any other use.
Please contact the appropriate regional office for additional information.