3003 W Casino Rd, Everett, WA 98204-1910


Last Updated April 25, 2016

Boeing submitted a draft Feasibility Study (FS) to Ecology in late 2015. The FS:

  • Evaluates cleanup alternatives.
  • Evaluates cost estimates of cleanup alternatives.

Ecology will respond to the draft FS report in writing.  Ecology expects the revised FS will be out for public comment in late 2016. We will decide the final cleanup alternatives for the site based on the information provided in the FS report and compliance with Washington State cleanup regulations.

On February 25, 2016, Ecology and Boeing attended a Boulevard Bluffs Neighborhood meeting. Boeing presented their draft FS findings and Ecology outlined the decision making process. Ecology is open to meeting with other community groups as we move forward with the public comment process. If you would like Ecology to present at your community group’s meeting, please contact the public involvement coordinator, Bridgette Valdez-Kogle.


The Boeing Company owns and operates the Boeing Everett Plant. The plant produces models 747, 767, 777, and 787 commercial aircraft.  Dangerous wastes are generated during aircraft assembly, and accumulated on site for less than 90 days.
Boeing used to store dangerous waste under a U.S. Environmental Protection Agency (EPA) Resource Conservation and Recovery Act (RCRA) interim status permit. Boeing no longer stores dangerous waste on-site for more than 90 days. However, Ecology will not withdraw Boeing’s interim status until all site wide cleanup is completed.

Signs along the Powder Mill Creek
Please click on the photo for a larger view


Over time, the facility released hazardous substances to soils, groundwater, surface water, and/or sediments. These hazardous substances include, but are not limited to: 

  • Chlorinated solvents (like TCE and PCE) 
  • Non-chlorinated solvents 
  • Fuels 
  • Oils 
  • Polychlorinated biphenyls (PCBs) 
  • Heavy metals

The 2012 RI identified TCE groundwater contamination on Boeing Everett property and migrating off Boeing Everett property. This contamination flowed north into Powder Mill Gulch).
TCE concentrations in groundwater are well above drinking water standards.  Although residents in the area receive drinking water from piped in off-site drinking water sources (and not the TCE contaminated Esperance Sand Aquifer), Ecology advises that no groundwater within or near the contaminated portion of the Esperance Sand Aquifer is withdrawn for any reason. 

As a safety precaution, Ecology advises that people and animals should stay on the walking trails adjacent to Powder Mill Creek and not enter or go near the creek.  There are TCE contaminated groundwater seeps on the creek banks. These seeps drain along the surface of the creek shore and eventually flow into the creek.  There are signs posted at visible trail entry points advising walkers to stay on the trails during the TCE groundwater remediation. 

Please click on the photo for a larger view


Ecology approved the Boeing Everett Remedial Investigation (RI) in 2012. The RI is an in-depth study to: 

  • Determine site features such as groundwater flow, sediment type, and other factors.
  • Define the type and extent of contamination.
  • Assess potential effects on human health and the environment.
  • Determine if interim cleanup actions are needed to either protect human health and the environment or to prevent a final cleanup from becoming more difficult if interim actions are not conducted earlier.
  • Determine which contaminated areas need cleanup evaluation in the Feasibility Study (FS).

The RI also determines if interim cleanup actions are needed to protect human health and the environment. Interim cleanup actions can be done before the final cleanup action plan.

Boeing is required to cleanup contamination at their Everett plant and all contamination that has migrated off the Everett plant. Ecology uses both RCRA and the Model Toxics Control Act (MTCA) regulations when overseeing cleanup of hazardous waste sites. These cleanup measures protect human health and the environment from releases of dangerous wastes and chemicals at and from the facility.

Powder Mill Gulch Trichloroethylene (TCE) Groundwater Contamination:
Ecology required Boeing to install a groundwater pump-and-treat system to minimize contaminated groundwater flowing off of the Boeing property and into Powder Mill Creek. This interim action was done prior to developing a final cleanup for the entire Boeing Everett facility (including Powder Mill Gulch).  The cleanup of Powder Mill Gulch is still on-going and the FS report is intended to develop the final cleanup remedy for Powder Mill Gulch.


Map showing site location as Snohomish County, WA SITE INFORMATION


View Electronic Documents

Cleanup Site Details Report

Facility Site ID: # 2703

Cleanup Site ID: 4534

Everett, Snohomish County

Status: Cleanup Started   Get definitions of Status terminology

Dean Yasuda
Site Manager
(425) 649-7264

Thea Levkovitz
Public Involvement Coordinator

Document Repositories:

Northwest Regional Office
3190 160th Ave SE
Bellevue, 98008

Everett Public Library
2702 Hoyt Street
Everett, 98201