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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. Scores correspond to a water quality status and are evaluated for improving or declining trends at each site. The status and trend analyses incorporate 10 years (currently water years 2012-2021) of water quality data.

View the 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