Combined Sewer Overflow Programs: Protecting our waters from stormwater, raw sewage and industrial pollution

By Kelly Susewind, Manager, Department of Ecology Water Quality Program



Projects to control combined sewer overflows provide an important solution to raw sewage discharges and stormwater treatment in the 11 Washington cities that have combined sewer and stormwater systems. Without controls over combined sewer overflows, heavy rains and snowmelt can cause large quantities of raw sewage from