An official website of the State of Oregon
How you know »
(how to identify a Oregon.gov website)
An official website of the State of Oregon »
You are here:
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 2013-2022) of water quality data.
View the Water Quality Index Map
Raw Data and Historical Status and Trends
Dan Brown, Water Quality Monitoring Program
A .gov website belongs to an official government organization in the United States.
A lock icon ( ) or https:// means you’ve safely connected to the .gov website.
Only share sensitive information on official, secure websites.
Your browser is out-of-date! It has known security flaws and may not display all features of this and other websites. Learn how