Seattle Public Utilities has a superior reputation for providing high-quality water to its customers. That tradition continues with the state-of-the-art Cedar Water Treatment Facility (CWTF) located southeast of Seattle at the Lake Youngs Reservation. Designed, built and operated by CH2M Hill, the award winning facility is a model for sustainable environmental design.
The CWTF facility provides 70 percent of the Seattle metropolitan area’s drinking water and can treat up to 180 million gallons (mgd) of water per day. The treatment operation relies on both time-tested and innovative technology that includes watershed protection and chlorination, as well as advanced ozonation and ultra-violet (UV) light disinfection.