City of Hillsboro, OR
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Hillsboro’s primary drinking water source is the upper-Tualatin River and its tributaries.
The Tualatin River stretches almost 80 miles from the Tillamook State Forest in Washington County to the Willamette River near West Linn. The Tualatin River has been Hillsboro’s only winter drinking water source for over 80 years.
The Tualatin River is unlike most rivers in the Northwest – it meanders slowly through relatively flat terrain before joining the Willamette River. It drains through more than 700 square miles of forested, agricultural, and urban areas. The Tualatin is Washington County’s only river and an important resource for the region. The river is used for regional drinking water supply, agricultural irrigation, and outdoor recreation.
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