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King County's Solid Waste Division is developing alternatives to maximize the capacity of the Cedar Hills Regional Landfill to meet the county's disposal needs as recommended in the King County Council approved 2019 Comprehensive Solid Waste Management Plan.


The Cedar Hills Regional Landfill has been in operation since 1965. It is the only active landfill remaining in the county and is the disposal site for all garbage generated by King County residents and businesses, excluding the cities of Seattle and Milton. The landfill is owned by King County and operated by the Solid Waste Division.

The King County Council approved the 2019 Comprehensive Solid Waste Management Plan (Plan) on April 24, 2019, that sets strategies for managing solid waste in King County over the next six to 20 years. The Plan addresses all aspects of the regional solid waste system, including curbside collection, processing of recyclable and compostable materials, and transfer and disposal of garbage. The Plan authorizes the Division to consider alternatives to maximize the capacity of the Cedar Hills Regional Landfill to meet the county's disposal needs.

View information about the 2010 Site Development Plan for Cedar Hills Regional Landfill.

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Cedar Hills Regional Landfill Site Development Project map
Cedar Hills Regional Landfill Site Development Project map – download PDF Download PDF 2 MB

Proposed development alternatives

There is one No Action Alternative and three Action Alternatives that will be evaluated in the Environmental Impact Statement.

Environmental review process

The State Environmental Policy Act (SEPA) external link requires that state and local agencies consider the probable adverse environmental impacts of a project before taking action. The King County Solid Waste Division, as lead agency on the project, is responsible for conducting the environmental review.

SEPA process summary

For more information about the State Environmental Policy Act (SEPA) process, please visit the Washington Department of Ecology.

The Solid Waste Division has determined that one or more of the alternatives being considered has the potential to result in a significant adverse impact to the environment and has issued a Determination of Significance Download PDF 375 K.

Scoping Period (July 25 – Aug. 26, 2019)

A 30-day scoping period from July 25 to Aug. 26, 2019 gave the public, tribal governments, and local, state, and federal agencies an opportunity to comment on the range of alternatives, areas of impact, and possible mitigation measures the EIS should evaluate. Comments received will be considered by the project team developing the Draft EIS, which is scheduled to be available for public review and comment in fall 2020.

Scoping Meeting

During the scoping period, the Solid Waste Division hosted a scoping meeting on Monday, Aug. 12, at the King County Library System Service Center, 960 Newport Way NW, Issaquah external link . Members of the public were invited to drop in to learn more about the proposal, ask questions, and provide written and oral comments.

Public involvement & project schedule

Public involvement

There are still opportunities for public comment and involvement on this project (see below).

Project schedule

  Updated August 2019 – subject to change



Sept 2019 – Feb 2020

A DRAFT EIS will be prepared

Mid 2020

The DRAFT EIS will be issued for public review and comment

Late 2020

A FINAL EIS will be issued that includes responses to comments received on the DRAFT EIS and identification of a recommended preferred alternative for maximizing landfill capacity at Cedar Hills Regional Landfill.



Ms. Kinyan Lui
Project Manager
King County Solid Waste Division
Telephone: 206-263-3685, TTY Relay: 711

Contact Us

 Call: 206-477-4466

TTY Relay: 711

Fax: 206-296-0197

King County Solid Waste Division mission: Waste Prevention, Resource Recovery, Waste Disposal