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Combined Sewer Overflow Control

By reducing combined sewer overflows into local water bodies, King County is protecting public health and the environment.
For questions about the King County CSO Control Program, please contact Karen Huber.

Wastewater Treatment Division
King Street Center
201 S. Jackson St., Suite 505
Seattle, WA 98104-3855

Get Directions to our office location in Seattle, Washington.

Real Time CSO Notification

CSO Control Program 2012 Plan Review

Public involvement through May 2012

King County worked closely with the regional community to review its CSO Control Plan between 2010 and 2012. This review included extensive engineering, environmental, technology evaluation, economic and social impact analysis to determine if, and how, King County’s CSO Control Plan should be modified. To ensure a thorough and transparent planning process, King County held workshops and meetings to share information with interested parties and gather feedback during the review.

Workshops and meetings, 2010 to 2011

Date - time - location Meeting topic Handouts/presentations (PDF)

Wed., Nov. 9, 2011
6:30-8 p.m., at the
REI store,
222 Yale Ave N, Seattle

Informational meeting about the County's Recommended Plan for CSO Control
Meeting materials
Wed., Nov. 17, 2010
9 a.m. - Noon
King Street Center
8th Floor Conference Center,
201 S. Jackson Street, Seattle
King County CSO Treatment Technology Workshop

The County is committed to controlling CSO’s to protect public health and the environment. As part of this work, the County is reviewing CSO treatment technologies to better understand their potential to reduce CSO pollution. The County will include promising treatment technologies in the CSO Control Plan Update it submits to the Washington State Department of Ecology in 2013.

The purpose of this workshop was to brief interested community members on the County's evaluation of treatment technologies, including the results from the County’s 2009 CSO treatment pilot, and to get input on the evaluation criteria the County will use to determine which treatment technologies to include in its 2012 Plan Update.

Workshop materials
Sept. 29, 2010
9 a.m. - 11:30 a.m.
Recreational Equipment Incorporated,
222 Yale Ave N
Workshop on the environmental science basis for control of King County CSOs
The CSO Control Program presented a workshop on the environmental science basis for control of King County CSOs on September 29 in Seattle. The purpose of this workshop was for interested parties and County staff to discuss the science that has developed since the Regional Wastewater Services Plan’s environmental priorities for CSO control were developed.
Workshop materials

Auxiliary information

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