Seattle Public Utilities Mami Hara, General Manager/CEO

2013 Water System Plan

Seattle is fortunate that the city has continued to make investments in its drinking water system, which serves approximately 1.3 million customers throughout the Puget Sound region. We have two protected watersheds, state-of-the-art treatment facilities, covered water storage facilities, and enough capacity to meet our needs until at least 2060.

Yet, like with many important utility services, the infrastructure is complex and needs to be carefully managed – from the mountain watersheds where it originates to the taps where it is used.

To maintain its high quality and reliability, Seattle Public Utilities updates its strategic, long-term plan regarding its drinking water system every six years. The 2013 Water System Plan is our latest update and we address many issues:

  • How are we ensuring reliable delivery of high-quality water into the future?
  • How could climate change impact that outlook?
  • What is the right level of water conservation?
  • How much do we need to invest to maintain our pipes and other facilities?

Plan Review and Approval

SPU released the Public Review Draft of the 2013 Water System Plan on April 2, 2012. A public meeting was held on April 17, 2012, to present the public with details about the plan and to provide a forum for discussion. The recommended final plan, which contained changes to address the comments received on the draft plan, was reviewed by Mayor Mike McGuinn and the Seattle City Council. In December 2012 City Council adopted the plan by ordinance.

The Washington State Department of Health approved the plan in April 2013.

View the Water System Plan

Plan Summary (pdf)
2013 Water System Plan – Volume I (pdf)
Appendices– Volume II (pdf)


Joan Kersnar (206) 684-0839,

This page was last updated on 5/3/2013.