Reclaimed Water Distribution System Improvements

Background

The City produces and distributes Class A reclaimed water during dry season months for non-drinking uses such as landscape irrigation. Reclaimed water is wastewater that gets treated to such a high level that it can be used safely for irrigation. Reclaimed water is available during dry season months during peak irrigation demand and when other water resources may be taxed by drought conditions.

Reclaime Water Distirbution Project Schematic Snoqualmie 2025

Description

These improvements will include construction of a new concrete reclaimed water reservoir and irrigation pump station located along Ridge Street and Eagle Lake Drive on Snoqualmie Ridge. The primary goal of this project is to improve the reclaimed water distribution system to that ensure high quality reclaimed water is delivered to customers throughout the irrigation season. This project will improve the existing reclaimed water infrastructure that has for two decades demonstrated water conservation and water quality benefits in the upper Snoqualmie Valley. 

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Cost

$9.1 million. This project is being completed with a Washington State Clean Water State Revolving Fund low-interest loan.

Timeline

Construction is underway and is expected to be completed summer 2026. Quarterly updates of construction progress are provided below:

The City’s Contractor has completed the walls, center columns, and roof of the new concrete reservoir. The new pump station pipe gallery and foundation has been installed, soon to be followed by the walls and roof. In Ridge Street the Contractor completed three new underground utility connections and restored the roadway.

During the first quarter of 2026 residents may notice a unique looking tower crane on site. This equipment will used to complete the circumferential prestressing of the reservoir structure. The reservoir will be wrapped with reinforcing steel cables which will counteract the interior liquid load and place the tank wall in 200 pounds per square inch residual compression. Think of it as the ultimate bear hug! Following prestressing, a thin layer of concrete will be applied to the outside of the tank to protect the steel cables. The result is a modern day seismically resilient concrete reservoir..

During first quarter of 2026, underground utilities within the site will also be installed including several vaults used for controlling and monitoring the distribution of reclaimed water from the site.

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The reservoir construction is advancing as planned with the final wall portion scheduled for completion next week.  Following wall construction, the roof will be placed and the entire reservoir will receive structural post-tensioning.

The work on Ridge Street includes completion of three new utility connections: sewer, water, and reclaimed water. The sewer and reclaimed water connections are complete. The water connection will be tested and completed later this week. The contractor is working diligently to complete all connections this week prior heavy rains forecasted for this weekend. Less frequent single-lane closures and road restoration work will occur next week.  Pavement patching will occur in November during allowable weather window.

Reclaimed Water System Improvements Project Reservoir Progress Oct. 2025

September 2025 Progress Update                  

The City Contractor has completed initial clearing and grading at the site and the erosion control measures are in place ahead of the wet-season. Subsurface utilities including reclaimed water, potable water, sewer, and stormwater are continued to be installed at the site. Utility connections will be made to the existing utility systems along ridge street including a new reclaimed water pipe, water main, and sewer discharge pipe.  During this phase of construction nearby residents should expect periodic single-lane closures with flaggers along Ridge Street while crews install the new utility connections and restore pavement 

The reservoir foundation has been installed and the pre-stressed concrete walls, center columns, and roof will be installed during fall 2025. The pump station pipe gallery has been installed, and the above ground portion of the pump station CMU building will begin to take shape later this year.

June 2025 Progress Update 

The City contractor will mobilize materials and equipment to the site and begin clearing and grading at the site for installation of subsurface utilities including stormwater, reclaimed water, potable water, and sewer piping. 

During this phase of construction nearby residents should expect periodic single-lane closures with flaggers along Ridge Street at Eagle Lake Drive.  High-visibility fencing will be installed around street trees along Ridge Street and tree protection zones at the site. Clearing and grading at the site will be completed under project cultural resource and environmental conservation plans.   Approximately 125 trees will be removed to install the new reservoir improvements.  These trees will be replaced with native trees and shrubs. To learn more about Forest Management and Stewardship in the City of Snoqualmie and opportunities to get involved click here.  

Construction activities at the site will pause August 4th through August 10th during the Boeing Classic Golf Tournament.  No utility interruptions are planned or expected during the summer 2025 construction period.

For Questions or to Learn More About the Benefits of Reclaimed Water: