2019 Water System Plan

Seattle Public Utilities provides reliable, high-quality drinking water to 1.4 million people who live in Seattle, King County and portions of southern Snohomish County. Thoughtful planning and strategic investment in our drinking water supplies and infrastructure will help ensure our region has enough water to meet the needs of our customers for decades.

To plan for long-term needs and meet regulatory requirements, Seattle Public Utilities regularly updates its Water System Plan. The 2019 Water System Plan is the latest update. It describes near- and long-term plans for the regional water system. It also focuses on updates to the water system and programs since the 2013 Water System Plan was completed.

The Plan describes how Seattle Public Utilities:

  • meets current and future water demands,
  • ensures high-quality drinking water,
  • enhances system reliability and resiliency, and
  • cost-effectively invests in and maintains the water system.

Plan Review and Adoption

SPU released the Public Review Draft of the 2019 Water System Plan on March 12, 2018. The recommended final plan, which contained changes to address the comments received on the draft plan, was reviewed by Mayor Jenny Durkan and the Seattle City Council. In October 2018, the plan, as recommended, was adopted by City Ordinance 125687.

Next, the Water System Plan will be reviewed for approval by King County and the Washington Department of Health in 2019.

View the Water System Plan – Public Review Draft, March 2018

Contact Information

Alex Chen
Drinking Water Planning & Program Division Director
(206) 684-7414

Archived Plans



This page was last updated on 10/17/2018.