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Tukwila Water Utility  

The City of Tukwila was incorporated in 1908 as a small community near the Duwamish River that included 418 acres of land adjacent to what is now known as Interurban Avenue South. Drinking water in those early times was supplied by several groundwater wells and the Green and Duwamish rivers. In 1929, the Tukwila Public Water System was formed, and a six-inch diameter steel water line was constructed to connect Seattle's Beacon Hill to Tukwila's North Hill area. During the late 1950s, the City annexed land that increased the City's area to 1,739 acres for a population of approximately 800 people. Minor annexations shortly after this added another 1,000 acres of land within the City limits. In 1964 federal funds were acquired by Tukwila, and major improvements and additions were made to the existing water distribution system.

Another wave of annexations starting in 1989 nearly doubled the City's land area to 5,513 acres and tripled the population from 4,760 to 14,631 people. Annexed areas added land to the north of the existing City Limits including Foster, Thorndyke, Cascade View, Riverton, and Fire District 1 areas. The City currently has a population of over 17,000 people. Drinking water was supplied by several water districts and public utilities before being annexed by the City. Since the annexations, the City has taken over the distribution system in many of the areas and assumed service to those customers. The entire King County Water District No. 25 distribution system along with 500 residential connections was assumed in 1990, and approximately 200 customers were transferred from the City of Seattle along the East Marginal corridor and Ryan Hill area in 1995 and 1996 respectively.

The City's service area is currently supplied entirely from the City of Seattle's water system through a long term purveyor contract. Nearly all of the water supplied to Tukwila comes from the Cedar River Watershed through the 60-inch Cedar River Pipeline No. 4 on the south and the 48-inch West Seattle supply line on the north. Surrounding water districts also have similar arrangements with the City of Seattle. Interties are maintained between several of these water districts and with the City of Tukwila for emergency use. Some of these water districts are also serving customers within Tukwila's corporate limits at the present time.


Frequently Asked Questions About The Water Utility

What is the water pressure in the Tukwila water system and what should it be into my building?

Water pressure depends on the specific supply zone and the elevation above mean sea level. In Tukwila the system pressure ranges from 150 psi in the valley area along the Green and Duwamish River to as low as 60 psi on the hill north of City Hall. The Uniform Plumbing Code requires a device known as a pressure reducing valve (PRV) on the service into a building. PRV's are typically set from 60 to 75 psi and can be checked by a qualified plumber.

Where is my water meter and can I turn it off?

The water meter is generally located at the property line along the street or near the driveway. Any operation or work at or near the meter is not allowed without the approval of the city. Your plumbing system should have a main shutoff valve along the service line (typically just inside the house foundation) in order to repair a leak or install new appurtenances.

How can I find out more about the quality of my drinking water?

View the current Annual Water Quality Report.

Water Related Links


Contact Information:

Public Works

6300 Southcenter Blvd.,
Tukwila, WA 98188

Phone: 206 433-0179
Fax: 206 431-3665

Email the Public Works Dept.