Wednesday - November 1, 2017

A Legacy for Generations – Safe, Clean, Reliable Drinking Water

The Lake Oswego Tigard Water Partnership Project is officially complete and under budget. Almost a decade in the making, this historic project has been no small feat. The project took more than five years of planning, permitting and designing, followed by four years of construction across four different communities, along major highways, in residential streets, through business districts, and under waterways.

The final cost for the project is $249 million, $5 million below the previous estimate of $254 million. Because of this lasting investment in public health, Lake Oswego and Tigard have the most reliable and resilient water system in Oregon, and a state-of-the-art treatment process that produces high-quality and better tasting drinking water year-round.

An accomplishment of this magnitude isn't done by one person alone. THANK YOU to our citizens and ratepayers in Lake Oswego and Tigard for supporting and investing in this project, and for our neighboring communities of West Linn and Gladstone, for bearing with us during construction of our new water system. THANK YOU also to the elected officials for your commitment and support, and the project team, staff, consultants and contractors for your outstanding efforts in helping us achieve our goals.

Please enjoy this video, "A Legacy for Generations - the Lake Oswego Tigard Water Partnership Project," which shares the story of the largest public works project Lake Oswego and Tigard have ever undertaken.

Even though this enormous project is finished and the construction crews are gone, the work doesn't end there. Our Partnership now transitions into daily operation and maintenance mode, with our water treatment plant operators, maintenance crews and water professionals running the system to keep the water flowing every day to almost 100,000 customers in Lake Oswego and Tigard.

Completed Water Treatment Plant

With the project coming to a close, our website has also transitioned from focusing on project construction, to treatment and everyday operation of the facilities. You'll find all the relevant information relating to the water partnership, helpful resources, the new system and facilities, the water treatment process and a project archive at

Our contact information has also changed. For partnership or water treatment plant questions, please call 503-635-0394 or email