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Water Quality Index

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


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