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Environmental review
This page lists environmental documents prepared by the King County Wastewater Treatment Division that are currently available for public review and comment.
Documents currently available for public comment
Title of proposal: Raging River State Forest Biosolids Program
Description of proposal: The King County Wastewater Treatment Division proposes to apply biosolids to Raging River State Forest lands in King County, Washington. The total project area is approximately 15 square miles. The purpose of this project is to use biosolids (the treated, stabilized, solid product of municipal wastewater treatment) for fertilization and ecosystem enhancement. Forest stands selected to receive biosolids will include thinned timber stands and young forest plantations. Forest applications recycle the nutrients from the biosolids while increasing the rate of tree growth, reducing soil erosion, and improving soil nutrient status. Biosolids production and application are federally regulated by the U.S. Environmental Protection Agency (EPA) under 40 CFR Part 503, and by the Washington State Department of Ecology under Washington Administrative Code (WAC) 173-308. The project is scheduled to begin in the Fall of 2025.
Location of proposal, including street address, if any: Raging River State Forest is located in King County, WA, south of Interstate 90 and east of State Route 18, in Township 23N, Range 7E, Sections 1, 11, 12, 13, 14, 15, 21, 22, 23, 24, 25, 27, 35, and 36, and Range 8E, Sections 6, 7, 18, 19, 20, 29, 30, and 32. The project area comprises 54 parcels, and approximate coordinates of the center of the project area are 47.472° N latitude and 121.859° W longitude.
Issue date: September 19, 2025
Comment deadline: October 6, 2025
Submit comments via email to: WTDSEPA@kingcounty.gov; or via postal mail to:
Jacob Sheppard Supervisor, Environmental Planning, King County Wastewater Treatment Division
201 S Jackson Street, MS KSC-NR-6200, Seattle, WA 98104-3855
For questions or information on how to submit comments electronically, contact Zanna Satterwhite, Environmental Planner, at 206-263-1998 or zsatterwhite@kingcounty.gov.
Download documents: Determination of Nonsignificance (DNS) and Environmental Checklist.
Frequently asked questions
The listed documents are mainly threshold determinations and checklists prepared under the Washington State Environmental Policy Act (SEPA statute, RCW 43.21C; SEPA Rules, WAC 197-11). Other environmental documents prepared by the Wastewater Treatment Division, such as documents prepared under the National Environmental Policy Act (NEPA), may also be listed.
Local, state and federal regulations mandate the ways in which agencies must notify the public that environmental documents are available for public comment. These may include mailings, signs and/or newspaper notices. The Wastewater Treatment Division typically makes the documents available in local libraries and upon request. This web page is another way in which the division provides notice and copies of these documents.
You may view and download an electronic copy of each listed document by clicking on the associated link. Information on how to provide comments on each document listed below is included in the document.
Yes. Please refer to the SEPA appeal process.