Thank you for your interest in the Portland Harbor Superfund Site. As of January 2017, the Lower Willamette Group (LWG) will no longer maintain information about the project on this website.

For background and updated information visit the links provided below:

U.S. Environmental Protection Agency:
Oregon Department of Environmental Quality:

About the LWG

In 2000, the U.S. Environmental Protection Agency (EPA) designated the Portland Harbor, a ten-mile stretch of the Lower Willamette River, as a Superfund site. In 2001, the LWG formed as a working group of the ten parties that signed an agreement with the EPA to conduct and support the Remedial Investigation and Feasibility Studies (RI/FS) necessary for cleanup of the site. Four other parties chose to contribute financially to the project. From 2001 to 2016, the LWG communicated as a group with the public about its work, the status of the RI/FS and its perspective on an appropriate cleanup of the Site. With requirements of the 2001 administrative order largely fulfilled, the LWG members will no longer engage in joint activities except as necessary to comply with the order. It is common for groups like the LWG to end their joint activities once the investigation, analysis and public comment process has concluded.


The LWG worked cooperatively with EPA and its partners, spending more than $115 million on technical studies and costs incurred by the federal, state and Tribal governments to oversee the project.

Through this work, the LWG provided agencies more than a million data points of sampling and analysis, making Portland Harbor one of the most intensely studied of any Superfund site in the nation.

The LWG actively engaged with the community to build awareness and encourage public involvement. It shared updates on its work and perspectives on the best approaches to an effective cleanup of the Portland Harbor.

The LWG is proud of its leadership and stands behind its work.

Lower Willamette Group:

Arkema Inc., Bayer CropScience, Inc., BNSF Railway Company, Chevron U.S.A. Inc., City of Portland, EVRAZ, Gunderson LLC, Kinder Morgan Liquids Terminals, NW Natural, Phillips 66 Company, Port of Portland, Siltronic Corporation, TOC Holdings Co., and Union Pacific Railroad Company.