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Tigard’s daily water demand ranges from 4.8 million gallons during the winter
to nearly 14.3 million gallons during summer months. Unlike many water utilities
Tigard does not have ownership of a water supply capable of meeting its customers
current (and not to mention future) demands for water. In order to meet customer
water demands Tigard has entered into wholesale water contracts with the Portland
Water Bureau (PWB), the City of Lake Oswego, the Joint Water Commission (JWC) and
the Tualatin Valley Water District (TVWD). Even with these many partnerships
additional supplies of water must be drawn from two city-owned groundwater wells
during the summer when demands are at their highest.
Last year, Tigard water purchased and produced nearly 2.5 billion gallons of water
and expects that number to grow.
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Joint Water Commission (JWC)
The Joint Water Commission is a partnership of water systems including the cities of
Beaverton, Hillsboro, Forest Grove, Tigard and Tualatin Valley Water District.
Currently the City of Tigard has a guarantee of 1.0 million gallons of water per day
during the summer peak season. The JWC does not have the infrastructure available to
deliver water directly to Tigard. As such, Tigard has entered into an agreement with
the City of Beaverton to wheel the JWC water through their water distribution system
for delivery to Tigard.
The JWC is a surface water source originating from the Tualatin and Trask River
watersheds located within the Coast Range. The water is treated at the Joint Water
Commission facility located south of Forest Grove.
City of Lake Oswego
The City of Lake Oswego draws its water supply from the Clackamas River Basin.
Encompassing nearly 940 square miles, the basin begins in the Mt. Hood National Forest.
Drawn from the Clackamas River the water is pumped through a pipeline buried deep beneath
the Willamette River to the Lake Oswego Treatment Plant located in West Linn.
Portland Water Bureau (PWB)
The City of Tigard purchases the majority of its water for the Portland Water Bureau
which obtains its water from the Bull Run Watershed. The watershed is located five
miles west of Mt. Hood and about twenty-six miles east of downtown Portland. Located
in the Mt. Hood Nation Forest, the Bull Run Watershed covers approximately 102 square
miles. Annual rainfall of 80 to 170 inches as well as snowmelt, contribute to the system
with two large reservoirs to catch and store water for year-round use. This surface
water source is unfiltered.
The City of Portland also has 24 production wells located near the Columbia River. These
wells help meet water demand during the summer and fall months, as well as provide a
backup source in emergencies.
Tualatin Valley Water District
The City of Tigard can also purchase water from the Tualatin Valley Water District
(TVWD). TVWD purchases their water from the Portland Water Bureau and the Joint
Water Commission.
Tigard's Groundwater and Aquifer Storage Recovery Wells
The City of Tigard currently operates one groundwater well and two
aquifer storage
recovery (ASR) wells.
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