Boeing Tulalip Test Site | Region 10 | US EPA

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Boeing Tulalip Test Site

Site Information


Dustan Bott (, Project Manager, 206-553-5502


Copies of technical documents are available at the Superfund Records Center. The Boeing Company will also make copies of the administrative record available upon request.

Facility Registry System (FRS) Report

Location of Boeing Tulalip Test Site near Marysville, Washington.

Site History: The Boeing Tulalip Test Site is a site with a Superfund alternative approach agreement located in Snohomish County, Washington, northwest of the City of Marysville. The roughly 525 acre site lies within the Quilceda Creek watershed. At the start of World War II, the U.S. Army condemned and purchased the property and established the Tulalip Backup Ammunition Storage Depot for use during the war. In 1949, the Army sold the land back to the Tulalip Tribes, who then leased the depot site to the Army and later to the Boeing Company.

The Army used the site as an ammunition depot and training center. Boeing used the site from 1954 to 1999 to conduct various tests on aviation and rocket components for military and commercial applications. Boeing closed the test facility in 1999 and began assessing the site and conducting voluntary cleanup.


Contamination has been found in both soil and water at the site. Three contaminants of concern were found in multiple locations: metals, Total Petroleum Hydrocarbons (TPH) and Volatile Organic Compounds (VOCs).

Investigation and Cleanup Activites

We are currently in the investigation stage, including:

  • Assessing current information about the contamination
  • Collecting additional information where necessary
  • Testing of a bioremediation technique used to decontaminate groundwater

Next stage will be the remedy design:

  • Designing a cleanup plan
  • Collecting public comments on the cleanup plan

Cleanup will tentatively begin in 2013.

Site Risks

Risk to People
Soil: Access to the site is limited to those with permission.
Water: At this time, the contaminated water plume does not pose a threat to drinking water supplies. The plume is being closely monitored to ensure that residences in the surrounding area that use groundwater for their drinking water source remain safe.

Risk to Wildlife
The Quilceda Creek watershed has known populations of Puget Sound Chinook salmon (Oncorynchus tshawytscha) and Coastal-Puget Sound bull trout (Salvelinus confluentus). Both species are listed as threatened species under the Endangered Species Act.

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