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 2010-2019) of water quality data.

 View Water Quality Index Map

Oregon Water Quality reports and documents

• 2019 Data summary
• 2018 Data Summary
• 2017 Data Summary
• 2016 Data Summary

Reference materials

• OWQI: Background, Analysis, and Usage  

Data downloads

Basin summary tables

• 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

Contact

Dan Brown, 503-693-5743