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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
2021 Data Summary
2020 Data Summary
2019 Data Summary
2018 Data Summary
North and Mid-Coast
Willamette, Sandy, Columbia
Umpqua, Rogue, South Coast
Hood, Deschutes, John Day, Umatilla, Grande Ronde
Powder, Malheur, Owyhee
Klamath, Closed Basins
Raw Data and Historical Status and Trends
Dan BrownWater Quality Monitoring Program503-693-5743
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