CSO Control Program reviews and plan updates
King County's CSO program issues two documents for a comprehensive review of program successes, updates, and future projects. The reviews and updates are done in approximately five-year intervals.
CSO Control Program Review
Program Reviews are submitted to the King County Executive and Council. The Program Review analyzes the need for CSO control, public involvement, and the relationship of the CSO control program to other county priorities. The control project schedule is verified and, if necessary, reprioritized based on any new information or data.
CSO Control Plan
As a part of the application for renewal of the county's West Point Treatment Plant's National Pollutant Discharge Elimination System (NPDES) permit from the Washington State Department of Ecology, King County submits an update to the CSO Control Plan about every 5 years.
Under Ecology's CSO regulation (WAC 173-245 CSO Control Plan Updates reviews the achievements of the program over the past five years, commits to the next phase of projects for CSO control for the next NPDES permit phase, and amends the plan for any proposed changes.
2012 CSO Control Plan amendment
In 2012, the King County Council and Executive approved nine recommended alternatives to control overflows that occur at 14 CSO locations in the regional wastewater system. These projects use both natural drainage and traditional infrastructure methods to control CSO outfalls.
|2012 Long-term CSO Control Plan Amendment (updated Appendix H )||Oct 2012||17.9MB|
|Summary version: Recommended Combined Sewer Overflow Control Plan||Jun 2012||2.6MB|
|2008 CSO Control Plan Update||Jun 2008||1.1MB|
|King County CSO Public Notification Feasibility Study||Jul 2007||2.8MB|
|CSO Control Program Review||Apr 2006||1.5MB|
|2000 CSO Control Plan Update||Jun 2000||6.1MB|
|King County CSO 5-Year Update: Task 4.0, Development of Alternatives||Dec 1997||43MB|
|METRO CSO 5-Year Update: Task 5 Report, RWSP System Alternatives, Supporting CSO Project Descriptions||Aug 1995||21MB|
|1995 CSO Control Update||Feb 1995||5.2MB|
|1986-1991 CSO Control Plan Update||Jan 1992||1.7MB|
|1988 CSO Control Plan||Apr 1988||4.3MB|
|1986 Final Supplemental Plan for CSO Control: Plan for Secondary Treatment Facilities and CSO Control, Volume 3||Jul 1986||6.6MB|