1120 SW 5th Avenue, Room 1000, Portland, OR 97204
In November 2011, Environmental Services completed a 20-year program to control combined sewer overflows (CSOs) and today the Willamette River is cleaner than it's been in decades.
Environmental Services collects water samples monthly at three locations on the Willamette River to track long-term water quality trends.
From May to October, bureau staff also collect weekly samples at five river recreational areas to track E. coli bacteria and temperature at public access points.
Get the latest bacteria and temperature test results.
Results from eight sampling locations
Monitoring river health in Portland
Sampling and analysis
More information about Willamette River water quality in Portland
View data from the U.S. Geological Survey's Willamette River monitoring station at the Morrison Bridge
July 9, 2015 Oregon Health Authority advisory