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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: South Plant Biogas Upgrade System Improvements Project
Description of proposal: The King County Wastewater Treatment Division proposes to modify equipment in the existing biogas system of the County’s South Treatment Plant to reliably meet renewable natural gas requirements for Puget Sound Energy’s natural gas distribution system. No improvements or work within the public right-of-way will be conducted. Project construction is scheduled to begin in mid-2026. The biogas modifications are scheduled to be operational by early-2027.
Location of proposal, including street address, if any: The structures in which the equipment is located are at 1200 Monster Road SW, Renton, Washington (parcel number 2423049006).
Issue date: February 7, 2025
Comment deadline: February 24, 2025
Submit comments via email to: WTDSEPA@kingcounty.gov; or via postal mail to:
Supervisor, Environmental Services, King County Wastewater Treatment Division
201 S Jackson Street, MS KSC-NR-5500, Seattle, WA 98104-3855
For questions or information on how to submit comments electronically, contact Rachael Hartman, Environmental Planner, at 206-477-4669 or rachael.hartman@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.