Tualatin Basin Water Supply Location Map



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Sustaining our economy, watershed, and community.

Water Needs Will Double by 2050

The residents and businesses in the Tualatin Basin need dependable, safe and secure fresh water to ensure the long-term economic health and livability of our region. Water needs are expected to double in the next 45 years which means an additional 50,000 acre feet of water per year.

Who Needs More Water?

As communities in the Tualatin Basin continue to grow, more water will be needed for municipal and industrial uses. In addition, more water is needed to augment flow in the Tualatin River and its tributaries for water quality. And farmers will continue to need water for agricultural irrigation.

Washington County is the economic engine of Oregon and it's an engine that runs on water. Hagg Lake—a federal facility—is the central component of our community's water supply and a major regional asset. Water from Hagg Lake supports nearly 250,000 jobs; provides drinking water for more than 400,000 residents; irrigates 17,000 acres of cropland; and sustains water quality in the Tualatin River to protect fish and wildlife habitat. The safety and security of Hagg Lake is essential to Oregon's economic health.

Visit the other pages of this site to learn about the Tualatin Basin Water Supply Project (TBWSP) including the history, current activities, project description and media stories.

Read about the Water Supply Project in the news.

Project Partners
The Tualatin Basin Water Supply Project is a collaborative effort among local water resources agencies. Clean Water Services is the lead agency for the project, providing project management and public involvement. Project partners currently funding the project include:

In cooperation with: