Storing Overflows Underground

Known for its incredible beauty and diversity of wildlife, the Puget Sound region of Washington provides abundant opportunities for such outdoor activities as kayaking and sailing. However, local water bodies historically have received discharges of untreated storm water and, during large storm events, combined sewer overflows (CSOs). Washington’s King County and the City of Seattle are committed to reducing the volume of CSOs in the Puget Sound region. To accomplish this, a series of new pipelines and a facility for treating overflows were recently installed in Seattle.