3003 W Casino Rd, Everett, WA 98204-1910


We invite you to review and comment on a draft Remedial Investigation, Feasibility Study, and Supplemental Feasibility Study; draft Cleanup Action Plan; Enforcement Order; draft Agreed Order; draft Permit Lite; draft State Environmental Policy Act Checklist; and draft Public Participation Plan for Boeing Everett in Everett, Washington.

SUBMIT COMMENTS NOW about the following documents: 

When the public comment period ends, we consider all public comments and may change the documents based on them. After considering all public comments, the documents will become final.

Public Meetings: At this time, there are no public meetings scheduled for this comment period. To request a virtual public meeting, please call 425-301-6454 or email


Ecology proposes to amend Boeing Everett's Prevention of Significant Deterioration (PSD) permit. The Boeing Everett facility manufactures commercial aircraft, specifically models 747, 767, 777, and 787. Boeing Everett asked to change its Prevention of Significant Deterioration (PSD) Permit for the 777X project. Boeing proposes to establish a higher limit for volatile organic compounds (VOCs) for the 777X wing components fabrication operations during low production periods.

SUBMIT COMMENTS FROM MARCH 17th - APRIL 16th on the Prevention of Significant Deterioration (PSD) Permit for the 777X project. Boeing proposes to establish a higher limit for volatile organic compounds (VOCs) for the 777X wing components fabrication operations during low production periods.

Mr. MengChiu Lim
Washington Department of Ecology
Air Quality Program
P.O. Box 47600
Olympia, WA 98504-7600


Last Updated April 12, 2021

The next stage in this process is the cleanup action plan (CAP). A public comment period on the CAP will run between February 15 - April 19, 2021. 

For 13 areas of soil contamination under Boeing buildings, the contamination will remain in place until it can be removed without disrupting facility production and operations. We require regular sampling of groundwater and indoor air to ensure the contamination does not impact human health or the environment. Groundwater will be pumped and treated to remove TCE and VC (vinyl chloride).

Ecology is using an Enforcement Order to implement the cleanup. Boeing refused to sign the Agreed Order because the groundwater cleanup levels are set to a level that is equal to surface water quality standards instead of state drinking water standards.

Ecology issued an Enforcement Order to implement the Cleanup Action Plan at the site. However, the portion of the site called the Bomarc property will be cleaned up under an Agreed Order so Boeing can sell the property. 

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


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.

Boeing submitted the draft Feasibility Study (FS) in late 2015. After review, the FS was completed in 2016.

The FS:

-Evaluates cleanup alternatives.
-Evaluates cost estimates of cleanup alternatives.

Boeing submitted a draft Supplemental Feasibility Study (SFS) in late 2018 for the Trichloroethylene (TCE) Plume at Powder Mill Gulch (PMG).

The SFS:

-Evaluates cleanup alternatives at PMG.
-Evaluates cost estimates of cleanup alternatives at PMG.

The PMG SFS was completed in late 2019.

Based on the evaluations presented in the FS and SFS, a draft Cleanup Action Plan (dCAP) was developed and completed by Ecology in late 2020.

The FS, SFS, and dCAP will be out for public comment in early 2021. Ecology decided the final cleanup alternatives for the site based on the information provided in the FS and SFS reports and compliance with Washington State cleanup regulations.

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 is TCE contaminated groundwater seeping from the creek banks that drains along the surface of the creek shore and eventually flows into the creek. There are signs posted at visible trail entry points advising walkers to stay on the trails during the TCE groundwater remediation. 


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. 
  • Determine which contaminated areas need evaluation in the Feasibility Study (FS).

Ecology received the Boeing Everett Feasibility Study (FS) in 2016.

The FS:

-Evaluates and selects cleanup alternatives for the entire site.
-Evaluates cost estimates of the selected cleanup alternatives for the entire site.

Ecology approved the Boeing Everett Supplemental Feasibility Study (SFS) in 2019.

The SFS:

-Evaluates and selects cleanup alternatives for Powder Mill Gulch.
-Evaluates cost estimates of the selected cleanup alternatives for Powder Mill Gulch.

Ecology completed the Boeing Everett draft Cleanup Action Plan (dCAP) in 2020.

The dCAP describes:

-The cleanup standards for the entire site.
-The cleanup methods that will be used to achieve these cleanup standards.
-The requirements the cleanup must comply with for the entire site.

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. In addition, interim actions to cleanup the source of contamination were conducted to reduce groundwater contamination. These interim actions were done prior to developing a final cleanup plan for the entire Boeing Everett facility (including Powder Mill Gulch). The cleanup of Powder Mill Gulch is still on-going. The dCAP is intended to present the cleanup remedy for the entire Boeing Everett facility (including 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

Paul Bianco
Site Manager
(425) 649-7253

Janelle Anderson
Public Involvement Coordinator
(425) 649-7286

Document Repositories:

Northwest Regional Office
3190 160th Ave SE
Bellevue, 98008

Everett Public Library
2702 Hoyt Street
Everett, 98201