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Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Avenue, Suite 1000, Portland, OR 97204

Willamette River Sampling

Collecting water samples in 1951The City of Portland began monitoring Willamette River water quality in the city limits in 1949 and periodically monitored the river for the next 40 years. In 1992, the Bureau of Environmental Services began regular water quality sampling. Environmental Services switched from monitoring fecal coliform to the E. coli standard in 1996 to comply with changes in state regulations.

The Environmental Services Field Operations section collects water samples each month at three locations on the Willamette River for long-term water quality trend analysis. Field staff usually collect samples in the first week of each month for nutrients, metals and bacteria.

From May to October, field staff also collect weekly samples from five recreational areas to give the public more frequent information about bacteria and temperature at Willamette River public access points.

Contact the Investigations and Monitoring Services section to request additional water quality data or for more information about Environmental Services water quality monitoring. 

Heartbleed Security Notice

A serious security vulnerability known as "Heartbleed" was recently discovered in OpenSSL, a popular software library commonly used by many websites on the internet to encrypt communication between a user's computer and a web server.

PortlandOregon.gov is NOT affected by this vulnerability as it does not use the OpenSSL software library. Please rest assured we are dedicated to protecting your security on this website.