The CSO Control Program

King County's CSO program implements the CSO Control Plan. The program employs various ways to control CSOs, including controlling pollution at its sources, optimizing flow management, monitoring and modeling flows in the system, and constructing CSO control facilities.

The program includes:

• Foundational studies
• Public notification and postings  
• Updates and reports (library page)
• Sediment management
• Regional Wastewater Services Plan