Protecting Oregon's Environment
Oregon State Seal
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

Ambient Water Quality Monitoring Network 

Ambient Monitoring

The Oregon Department of Environmental Quality (DEQ) is responsible for keeping Oregonís surface waters safe and healthy for a variety of uses such as drinking water, recreation, fish habitat and irrigation. To monitor status trends in water quality, DEQ regularly collects water samples at over 130 sites on more than 50 rivers and streams across the state. Sites were chosen to represent important positions within each basin, acting as integrator sites to represent major land uses..

Sites are visited every other month throughout the year. Water quality parameters that are measured include alkalinity, biochemical oxygen demand (BOD), chlorophyll a, specific conductance, dissolved oxygen (DO), DO percent saturation , e. coli, ammonia, nitrate & nitrite, pH, pheophytin a, dissolved ortho-phosphate, total phosphate, total solids, temperature and turbidity.

Some sites have been routinely monitored since the late 1940's. Ambient monitoring is used to understand trends in Oregon's water quality over time, determine whether there is too much pollution in a water body, and set limits of how much pollution a water body can safely receive. Ambient monitoring data is also used to determine the Oregon Water Quality Index.

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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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