Boeing Renton
Current Status
Boeing Renton continues to conduct sitewide bioremediation injections and monitoring, as outlined in the Cleanup Action Plan, Engineering Design Report, and the Compliance Monitoring Plan.
Ecology is currently conducting a Periodic Review for this site. This review will be out for public comment May 18 – June 19, 2026.
Site Background
This facility produces 737 model commercial aircraft. Manufacturing operations include parts preparation, mechanical assembly, coating, testing, and other support operations associated with the final assembly of airplanes.
In 2021, Boeing encountered an oily sheen during construction and are conducting an investigation to determine the nature and extent of any contamination in that area.
In 2025, an unintended release of aqueous film-forming foam (AFFF) occurred at the Compass Rose area while water was being drained from an Aircraft Rescue and Firefighting vehicle prior to off-site transport for AFFF removal and disposal. The release affected roughly 13,000 square feet of paved surface and less than 400 square feet of adjacent grassy area. Prompt cleanup was conducted by Boeing to address affected paved surfaces and grassy areas. Confirmation soil sampling conducted after excavation of adjacent grassy area detected several per- and polyfluoroalkyl substances (PFAS) compounds at concentrations that exceeded at least one regulatory screening level. Further investigation will be needed to determine the extent of PFAS contamination at Boeing Renton.
Site Contamination
Manufacturing aircraft requires many kinds of hazardous materials. The used or discarded materials are managed under an interim status hazardous waste permit.
In May 1990, EPA conducted a site assessment and found that hazardous substances were released to soil and groundwater from several different locations at the facility. The releases were mainly from tank leaks and spills.
In August 2001, The Boeing Company completed the site remedial investigation. This investigation showed that soils and groundwater in localized areas beneath the facility were contaminated with various solvents and petroleum products from leaks and spills over the years.
These hazardous substances include:
- Solvents
- Fuels
- Oils
- Heavy Metals
Cleanup
Ecology uses the Model Toxics Control Act (MTCA) for cleanup of hazardous waste sites. There are many steps to the cleanup process. The most important steps that the public can get involved in are the Remedial Investigation, Feasibility Study, and Cleanup Action Plan. Boeing is now carrying out the Cleanup Action Plan (CAP).
The CAP describes the selected cleanup methods. It also states cleanup standards and other requirements. The CAP is based on information and technical analyses from the RI/FS and public comments and community concerns.
The Cleanup Action Plan was prepared and approved, and an Agreed Order (No. 8191) to carry out this Cleanup Action Plan became effective in January 2013. Boeing is performing routine groundwater monitoring and, where required, cleanup at 10 different locations. Four of them are located on a property leased at Renton Municipal Airport.
Groundwater is treated by injecting oxygen- or hydrogen-releasing material into the groundwater. This material enhances microorganism activity which degrades and removes contaminants through biological reaction.
Contaminated soil vapor are extracted and treated at:
Groundwater is treated by injecting oxygen- or hydrogen-releasing material into the groundwater. This material enhances microorganism activity which degrades and removes contaminants through biological reaction.
Interim Cleanup Actions
Over the past 18 years, several interim cleanup actions were done to prevent contaminants from reaching Lake Washington and the Cedar River, and to protect industrial workers from potential exposure to contaminated soils. Contaminated groundwater was pumped and treated, and contaminated soils were excavated. Any residues left in soil and groundwater underneath are currently being treated by enhanced bioremediation.
Documents 50
Legal 3
| Document Title | Document Date | Document Type |
| Boeing Renton Agreed Order for CAP | 1/2/2013 | Agreed Order |
| Boeing Renton Amendment 1 to Agreed Order DE 97HZ-N233 | 12/9/2004 | Agreed Order Amendment |
| Boeing Renton Agreed Order for RI/FS DE 97HZ-N233 | 10/10/1997 | Agreed Order |
Outreach Information 2
| Document Title | Document Date | Document Type |
| Boeing Renton Public Participation Plan 05/05/26 | 5/5/2026 | Public Participation Plan |
| Boeing Renton Public Notice 05/05/26 | 5/5/2026 | Fact Sheet\Public Notices |
Technical Reports 44
Tribal Engagement 1
| Document Title | Document Date | Document Type |
| Tribal Engagement Plan Boeing Renton May 2026 FINAL | 5/11/2026 | Tribal Engagement Plan |
Places to see print documents
-
Northwest Regional Office15700 Dayton Ave NShoreline, 98133This location may only have print documents available during open comment periods.
-
Renton Library100 Mill AveRenton, 98057This location may only have print documents available during open comment periods.
Contaminants 11
| Contaminant Type | Soil |
Groundwater |
Surface Water |
Air |
Sediment |
Bedrock |
|---|---|---|---|---|---|---|
| Halogenated Organics - Halogenated Organics | C | C | S | |||
| Metals - Metals Priority Pollutants | C | C | S | |||
| Metals - Metals - Other | C | C | S | |||
| Halogenated Organics - Polychlorinated biPhenyls (PCB) | C | C | S | C | ||
| Non-Halogenated Organics - Petroleum Products-Unspecified | C | C | S | |||
| Non-Halogenated Organics - Phenolic Compounds | C | C | S | |||
| Non-Halogenated Organics - Non-Halogenated Solvents | C | C | S | |||
| Non-Halogenated Organics - Polycyclic Aromatic Hydrocarbons | S | S | S | C | ||
| Reactive Wastes - Corrosive Wastes | S | S | S | |||
| Other Contaminant - Conventional Contaminants, Inorganic | C | C | S | |||
| Other Contaminant - Asbestos | S | S | S |
- S
- Suspected
- C
- Confirmed Above Cleanup Levels
- B
- Below Cleanup Levels
- RA
- Remediated-Above
- RB
- Remediated-Below
- R
- Remediated
Public Comment Period
Draft periodic review: Every five years
we review the cleanup progress.
Draft public participation plan: This plan encourages community involvement in cleanup decisions.
Submit comments online: ecology.wa.gov/
By mail: Michelle Myers, Site Manager, Department of Ecology, Northwest Region Office, P.O. Box 330316, Shoreline, WA 98133
Public meeting: At this time, there are no public meetings scheduled for this comment period. To request a public meeting, please call 425-301-6454 or email janelle.anderson@ecy.wa.gov.
What happens next?
The public comment period is open from May 18 to June 19, 2026. After the comment period ends, we will review and consider all comments we receive. The documents may change based on your comments. After we consider all the comments, the documents will become final. When there are new documents about the site, we’ll notify you about additional public comment periods.
Language Services: We offer translation and interpretation services at no cost. To request them, email janelle.anderson@ecy.wa.gov or call 425-301-6454. If you call, please ask for an interpreter.
Español (Spanish): El Departamento de Ecología está anunciando el período de comentarios públicos relacionado a la limpieza ambiental del sitio Boeing Renton en Renton. Lea el documento en español. Si tiene alguna pregunta sobre la limpieza o sobre cómo hacer comentarios, contacte a Janelle Anderson llamando al 425-301-6454 o escribiendo a janelle.anderson@ecy.wa.gov. Por favor solicite un intérprete al hacer su llamada y espere a que le conecten con uno. El Departamento de Ecología ofrece servicios de traducción e interpretación libre de costo.