Water Quality

The Oregon Water Quality Index analyzes a defined set of water quality variables and produces a score describing general water quality for a particular monitoring site in the ambient monitoring network. In this map, scores are color-coded to indicate water quality status, and evaluated for improving or declining trends at each site. The status and trend analyses incorporate 10 years (currently water years 2011-2020) of water quality data.


 View Water Quality Index Map


Oregon water quality reports and documents

Reference materials

Data downloads

Basin summary tables

Raw data and historical status and trends




Dan Brown, Water Quality Monitoring Program