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In The News

Fix a Leak Week

March 23, 2017

In recognition of national Fix a Leak Week, students at Discovery Elementary School in Sammamish learned how to construct a drip irrigation system to water vegetables in their school garden. They won’t waste a drop to grow healthy, organic food!     Share this:

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2017 Lake Tapps Reservoir Spring Refill Update

March 17, 2017

Cascade Water Alliance and the Lake Tapps Community Council announced today that the Lake Tapps Reservoir has reached recreation minimum pool levels (elevation 541.5 feet) a month ahead of the April 15 deadline. Cascade will raise the reservoir, as it does each year, to the maximum full recreational level of elevation 543 feet during the middle of May to remind homeowners of the highest allowable level this reservoir can go in concert with existing homeowners’ agreements with Cascade. Cascade will then maintain the Lake

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Dikes Surrounding Lake Tapps Inspected

March 06, 2017

Washington State’s Dam Safety Office (DSO) took advantage of the drawdown of the Lake Tapps Reservoir to do its proscribed evaluation of the dikes surrounding the reservoir in February. The reservoir was originally created by flooding four small lakes and is held in place as “Lake Tapps” by a series of 15 dikes. These earthen dikes are inspected at least once every five years to determine safety and security. The DSO inspected the reservoir (water) side of 13 of the dikes and

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Lake Tapps Spring Fill to Begin This Week

February 21, 2017

The Lake Tapps reservoir has slowly begun to refill due to rain and snowmelt. Active refill will begin about February 28, and is anticipated to rise rapidly, as much as 3 to 4 inches a day (2 to 2.5 feet per week). Full recreational level of 541.5 feet is expected by mid-March.  For more details click here. Share this:

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Cascade and Partners’ Water Supply Work Honored by Harvard

January 18, 2017

Cascade Water Alliance and partners of the Central Puget Sound Water Supply Forum were honored by Harvard University as one of the 2017 Bright Ideas in Government for policies, initiatives, and best practices. The Forum identified potential challenges to the region’s water supply with earthquakes, water quality issues, drought and climate change. The Forum’s goal is to ensure safe, reliable quality water for the region’s 2.3 million residents and businesses. For more information, click here. Share this: Read More

Lake Tapps Winter Levels Updated; Short Drawdown Scheduled

January 10, 2017

There will be a short-term drawdown for the Lake Tapps Reservoir this winter in conjunction with the installation and testing of valves at the Powerhouse. The drawdown will begin this weekend, and over the next three weeks the reservoir will be drawn down 6′ – 8′ to approximate elevation 536.5′. The reservoir will be maintained around that 536.5′ level, weather dependent, until refill begins in early March. If homeowners are considering improvements or new projects, early February to early March will be a good time to do them. Appropriate

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Lake Tapps Winter Levels Update – Short Drawdown Scheduled

November 10, 2016

Lake Tapps level is expected to stay at approximately 541′ to 542′ through mid to late January, when Cascade anticipates completing installation of a new valve at the Powerhouse. Around Feb. 1, Cascade plans to test the new $2 million valve, which has been installed to ensure even more reliability and safety in operating the reservoir. To do so, Cascade will draw the reservoir down approximately 6′ to 8′, reaching an elevation around 535′ in late February. The reservoir level will then be maintained around 535′ through early to mid-March. If

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Our Mission

As our magnificent region continues to grow, so do the demands for clean, safe reliable drinking water.

"At Cascade, we plan for water out 25 to 50 years to ensure the viability of our communities."
- John Marchione, board chair

Cascade's mission is to provide water supply to meet current and future needs of our members in a cost-effective and environmentally responsible manner through partnerships, conservation, acquiring, constructing and managing water supply infrastructure and fostering regional water planning.

Members are Our Source of Quality

Our local member cities and utilities are the source of water quality, making sure our 350,000 residents and 20,000 businesses receive great tasting high quality water today... and tomorrow.

Cascade's Vision for Today...and Tomorrow