Holiday closure Monday May 28: Most county offices will be closed in observance of Memorial Day.

For questions about the Wastewater Treatment Division website, please send an e-mail message or contact us at:

King Street Center
201 S. Jackson St., Suite 500
Seattle, WA 98104-3855
Phone: 206-684-1280
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

Get Directions to our office location in Seattle, Washington.

Staff Contacts

Puget Sound shoreline next to the West Point Treatment Plant, Seattle

Hidden Lake Pump station replacement and sewer improvement

Library

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Project and construction updates

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Fact sheets

Environmental documents

Technical reports

  • Hidden Lake Service Area Report, May 2000. This report evaluates the existing Hidden Lake service area, pump station, and related conveyance system components. Wastewater planning for the service area is driven more by the need to address the immediate concerns of alleviating the operational difficulties at the Hidden Lake Pump Station, managing peak wet weather flows while anticipating the effects of future sewer deterioration, and controlling odor, rather than accommodating future growth.
    Source: Conveyance System Improvement Program.

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