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Title

King County Denny Way CSO Cleanup Site Fact sheet – AO/PPP – January 2026

DRAFT FOR PUBLIC COMMENT Comment on this draft
 
Publication number Date Published
25-09-156December 2025
VIEW NOW King County Denny Way CSO Cleanup Site Fact sheet – AO/PPP – January 2026 (Number of pages: 4) (Publication Size: 843KB)
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Author(s) Meredith Waldref
Description The King County Denny Way Combined Sewer Overflow site is located along the shoreline of Elliot Bay next to Myrtle Edwards Park in Seattle. Combined sewer overflows (CSOs) are locations where stormwater and sewage mix and are discharged during heavy rainfall events. In the early 2000s, the CSO at this location was closed, and a partial cleanup (known as an Interim Action) was completed; however, additional cleanup is still needed.
The Department of Ecology (Ecology) invites you to review the following documents for the Denny Way CSO site (Site):
• Agreed Order: This new legal agreement between Ecology and King County requires King County to study the contamination in a remedial investigation, evaluate cleanup options in a feasibility study, and develop a draft cleanup action plan for the Site.
• Public Participation Plan (PPP): A document explaining how people can participate in the cleanup process
NOTES Ecology – NW Regional Office: 15700 Dayton Ave. N., Shoreline Seattle Public Library – Central Branch, 1000 Fourth Avenue, Seattle, WA 98104
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Contact Brett Carp at 206-496-7007 or brett.carp@ecy.wa.gov
Keywords Seattle, Elliott Bay, Salish Sea, King County, wastewater, stormwater, Puget Sound, CSOs, Myrtle Edwards Park
WEB PAGE King County Denny Way CSO cleanup site
CLEANUP SITE Cleanup Site ID: 2582

FACILITY SITE Facility Site ID: 4455938

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