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About SPU > Water System > Water Quality & Treatment > Tolt Treatment Facility

Tolt Treatment Facility

Seattle Public Utilities' Tolt Treatment Facility began operation at the end of 2000. The facility provides 120 million gallons of water a day to customers in Seattle and suburban cities. It is the City's first filtration and ozonation facility.



The plant was created in a private-public partnership with Azurix CDM, who has a 25-year design-build-operate contract with the City of Seattle. This partnership resulted in a $70 million cost savings for ratepayers.

Project Information
For information on this project, please contact SPU’s Project Manager:


Alex Chen
Senior Water Quality Engineer / DBO Contract Manager
Seattle Public Utilities
700 5th Avenue, Suite 4900
PO Box 34018
Seattle, WA 98124-4018
(206) 233-1522

alex.chen@seattle.gov


Related links
Tolt River Watershed

Cedar Treatment Facility