Advisory: Partially treated sewage enters Willamette River near Lake Oswego’s Foothills Park due to equipment malfunction during maintenance

News Article
An equipment malfunction during scheduled maintenance at a City of Portland wastewater plant led to a discharge of partially treated wastewater to the Willamette River near Lake Oswego’s Foothills Park.

The City of Portland Bureau of Environmental Services advises the public to avoid the Willamette River around Foothills Park for 48 hours due to the possibility of increased bacteria in the water.

During scheduled maintenance and cleaning of electrical components, a mobile generator was deployed to keep a pump station at the Tryon Creek Wastewater Treatment Plant operating. The generator failed at approximately 10:15 a.m. on June 14 and was fixed within 15 minutes. An estimated 30,000 gallons of partially treated wastewater were discharged during the 15 minutes the generator was down. The wastewater had undergone primary treatment – screening, grit removal, and sedimentation – prior to discharge.

The City of Portland and Lake Oswego are working together on a plan to replace the aging Tryon Creek Wastewater Treatment Plant. For more information about the project, visit the City of Lake Oswego’s Wastewater Treatment Facility webpage.

About Environmental Services
Environmental Services - the City of Portland’s sewer and stormwater utility - protects public health and the environment by collecting and recovering resources from the city’s wastewater, managing stormwater, and restoring and protecting Portland’s rivers, streams, and watersheds.