Protecting Oregon's Environment
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Oregon Department of Environmental Quality

Laboratory and Environmental Assessment

Water Quality Monitoring

Air Quality Index 
Air Quality Monitoring
LASAR Database
Guidance and Quality Assurance
Technical Reports
Volunteer Monitoring
Water Quality Index
Water Quality Monitoring

Oregon 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 2006-2015) of water quality data.

Click on the dots to find location information and up to date OWQI results. The meaning of the colors and symbols can be found in the map legend. To search by latitude and longitude, enter the longitude first.

Additional Resources

OWQI Reports and Documents

Reference Materials

OWQI: Background, Analysis, and Usage

Data Downloads

2015 Basin Summary Tables

Raw Data and Historical Status and Trends



Lesley Merrick, 503-693-5724 or email
Dan Brown, 503-693-5743 or email

[print version]

For more information about DEQ's Laboratory and Environmental Assessment Program please email LEAP.


Oregon Department of Environmental Quality
Headquarters: 700 NE Multnomah Street, Suite 600, Portland, OR 97232
Phone: 503-229-5696 or toll free in Oregon 1-800-452-4011
Oregon Telecommunications Relay Service: 1-800-735-2900  FAX: 503-229-6124

The Oregon Department of Environmental Quality is a regulatory agency authorized to protect Oregon's environment by
the State of Oregon and the Environmental Protection Agency.

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