Project Overview & Important Facts

TVWD has hired Emery and Sons to:

• Build a house-like structure, which will enclose pressure regulating valves to control the flow of incoming water from the Willamette Water Supply System (WWSS) and equipment to fluoridate the water, as approved by voters in 1963. 
• Connect to an access vault for the WWSS distribution pipe outside of the house-like structure and on the north portion of the site.
• Install two pipeline segments to connect the project site to an existing water main on Farmington Road and to an existing reservoir on Grabhorn Road via Leland Drive.

The site will be re-graded to make the elevation more consistent with Farmington Road and 209th Avenue. The site will have access driveways for vehicles to:

• Enter from Farmington Road via a right-turn only.
• Exit onto 209th Avenue via a right-turn only.  

The site will have security fencing surrounding the perimeter, including around the vegetated stormwater features in the northeast corner. 

This latest proposed project has a significantly smaller scope, resulting in reduced operations from the original project proposals that were presented in 2019 and 2020. 

What are pressure regulating valves?

Pressure regulating valves, sometimes called pressure reducing valves, adjust the flow rate and water pressure from one zone (area) to another. This enables TVWD to maintain water pressure throughout the entire water system, as water flows between varied topographies within our geographic service area. TVWD maintains many valves of this type throughout the water system. 

For 209th & Farmington, pressure regulating valves will control how much water flows into the water system and simultaneously reduce the incoming pressure to be suitable to distribute to homes and business. 

How is water fluoridated?

TVWD’s certified operators add sodium fluoride to saturator tanks. Fluoride dissolves into water within the tanks and is added in a controlled manner into incoming, un-fluoridated, treated, water as it flows through the facility. Digital analyzers continuously measure fluoride levels to adjust the amount needed based on flow rate, ensuring 0.7 milligrams per liter enters the water system.

TVWD operates fluoridation systems like this at each fluoride station in the District, consistent with public health and industry best practices.  

Other interesting facility facts:

• With minimal upgrades to the facility, it has the capacity to receive a maximum flow rate of 17 million gallons per day.
• Initial operation will flow 3 million gallons per day.
• During the Grabhorn Reservoir replacement, a pipeline was installed from the reservoir down to the intersection of SW Leland Drive and Grabhorn Road. This pipeline will be connected to the proposed Farmington site, reducing the amount of construction and neighborhood impacts by limiting the amount of new pipe to be installed.