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Comment Period

West Point Wastewater Treatment Plant

National Pollutant Discharge Elimination System (NPDES) Wastewater Discharge Permit

April 5, 2023 - July 7, 2023, 11:59 p.m.

We invite your comments on the draft NPDES permit for the West Point Wastewater Treatment Plant and associated collection system.

Ecology wants to hear from you about the draft water quality permit for the West Point Wastewater Treatment Plant operated by King County’s Wastewater Treatment Division. Please read this webpage for background and how to submit your comments on the draft permit.

Read the draft permit and fact sheet.

We must receive your comments before midnight on July 7, 2023 (extended from the original closure date of June 5, 2023). We held two virtual public meeting and hearings about the draft permit on May 9 and 16th. Written comments receive the same consideration as oral testimony.

We created a focus sheet to summarize this process and highlight how the permit, once issued, will help to protect surface waters around Seattle.

Download the public hearing presentation slides (PDF)

Ecología creó una hoja informativa para resumir este proceso y destacar cómo el permiso, una vez emitido, ayudará a proteger las aguas superficiales alrededor de Seattle.


주 환경부는 허가 갱신 프로세스를 설명하고 허가 초안에 포함된 조건을 요약하는 포커스 시트를 만들었습니다.

Bộ Môi Sinh đã viết một tờ tiêu điểm để tóm tắt quy trình này và nêu rõ cách thức giấy phép, sau khi được cấp, sẽ giúp bảo vệ vùng nước mặt xung quanh Seattle.


The West Point Wastewater Treatment Plant (West Point), located near Seattle’s Magnolia neighborhood, treats domestic sewage and stormwater from the Seattle area. West Point treats sewage from homes and businesses, as well as industrial wastewater. Read the blog: West Point Treatment Plant water quality permit up for review.

The draft permit establishes conditions King County must meet to legally discharge treated wastewater to Puget Sound. It also contains requirements to control water pollution from combined sewer overflows (CSO) that discharge into surface waters around Seattle. Collectively, the requirements in the draft permit establish the minimum standards King County must meet to protect water quality.

The draft permit includes requirements related to the following topics:

  • limits on the amount of pollutants King County may discharge
  • monitoring and reporting of wastewater discharges
  • operations and maintenance of wastewater treatment and collection facilities
  • responding to permit violations
  • controlling pollutants from combined sewer overflows (CSOs)
  • controlling industrial wastewater before it enters the sewage system
  • engineering design work to improve water quality protections

The fact sheet explains the legal basis for Ecology’s decisions about the requirements in the draft permit. This includes describing the standards we apply and how we calculate numerical limits on pollutants.

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Comment by mail

Tricia Miller, Permit Administrator
WA State Dept of Ecology - NWRO
PO Box 330316
Shoreline, WA 98133-9716
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Sean Wilson
Permit Manager

To request ADA accommodation, contact Ecology's ADA Coordinator by email at ecyadacoordinator@ecy.wa.gov, or call 360-407-6831, 711 (relay service), or 877-833-6341 (TTY). More about our accessibility services.